EPSO EU Knowledge: Why Your Wrong Answers Cluster on One Option

Short version. Mistakes in the EU knowledge section are not spread evenly across the wrong options. They pile up on one of them. In 161 of the 448 questions in our bank that had enough wrong answers to measure, more than 60% of every mistake made on that question landed on the same incorrect option. If mistakes were scattered at random you would expect that to happen in about 13 questions. It happens in 161 — roughly 12.5 times more often than chance.

This post gives you the measurement, the date, the method so you can argue with it, and — the part that is actually useful in a study session — the families of EU concepts that swallow those mistakes, and how to tell them apart.

What exactly was measured, and when?

Data from the Pass EPSO EU knowledge question bank, as of 13 August 2026. The scope and the filters:

• Scope: all 1,371 active EU knowledge questions in the bank.
• Filter: only questions that had accumulated at least 10 wrong answers. Below that, a "concentration" figure is noise — with two mistakes on a question, "100% on one option" means nothing. 448 questions cleared that bar.
• The metric: for each question, take only the wrong answers, and ask what share of them went to that question's single most-chosen incorrect option.

Everything below is expressed as percentages and question counts. We do not publish how many people answered anything.

How concentrated are the mistakes?

• 161 of 448 questions (35.9%) have more than 60% of their wrong answers on one single incorrect option.
• Across all 448 measurable questions, the median top-distractor share is 55% — that is, in the typical EU knowledge question, more than half of everything that goes wrong goes wrong in the same direction.
• Within those 161 questions, the median share is 71.4%. 92 sit at 70% or above, 41 at 80% or above, 11 at 90% or above, and 3 questions are at 100%: every single person who missed them missed them the same way.
• These are not the impossible questions. The median accuracy on those 161 items is about 62% — most people get them right. The minority who don't, fail identically.

What would it look like if mistakes were random?

This is the number that makes the pattern real rather than interesting. If every wrong answer on a question were thrown at the incorrect options at random, you can compute how often a single option would still take more than 60% of them, question by question, using each question's actual number of wrong answers and its actual number of incorrect options.

Summed over the same 448 questions, that expectation is 12.9 questions (2.9%). The observed figure is 161 (35.9%). That is a factor of 12.5.

So the wrong options in an EU knowledge test are not interchangeable. One of them is doing nearly all of the work.

What do the magnet answers have in common?

This section is our reading, not a measurement. The percentages above are counted; the explanation below is our interpretation of why a particular option attracts the mistakes, and you should treat it as an argument rather than as data.

Our reading is this: the option that swallows the errors is almost always a right answer to a slightly different question. It is not a wrong fact. It is a correct entity, correct law, or correct procedure — imported from the neighbouring context. The Commission where the Council acts. The European Data Protection Board where a national authority is competent. The Digital Services Act where the Digital Markets Act applies.

One partial check we can put a number on: a mechanical keyword scan of those 161 questions finds that in 49 of them (30.4%), the winning distractor names an EU institution, body or legal act that the correct answer does not name at all. That is a floor, not a ceiling — a keyword scan cannot see a swap that is paraphrased rather than named — but it points the same way.

Which families get confused with each other?

Here are the confusions that show up most sharply in the data, with the official source for each so you can verify the distinction yourself rather than take our word for it. The percentage after each one is the share of that question's wrong answers that went to the named option, as of 13 August 2026.

Who acts: the Council, the European Council, the Commission or the Parliament?

Accession to the EU (93% of wrong answers chose "European Council"). Under Article 49 TEU, an applicant state addresses its application to the Council, which acts unanimously after consulting the Commission and after obtaining the consent of the European Parliament. The European Council is the body of heads of state or government and sets accession criteria politically — it is not the body named in Article 49 for this decision.

Budget discharge (83% chose "European Court of Auditors"). Under Article 319 TFEU, it is the European Parliament, acting on a recommendation from the Council, that gives the Commission discharge for implementing the budget. The Court of Auditors audits and reports; it does not grant the discharge. The distractor is correct about who does the auditing and wrong about who signs off.

How to keep them apart. Ask what kind of act the question is about. Legislating or formally deciding under a treaty article: read the article and take the named institution literally. Setting political direction and priorities: European Council. Proposing and enforcing: Commission. Democratic control, budget discharge, consent: Parliament.

GDPR: the national supervisory authority or the European Data Protection Board?

One-stop-shop competence (100% of wrong answers chose "European Data Protection Board"). Under Article 56 of the GDPR (Regulation (EU) 2016/679), the supervisory authority of the controller's main establishment is competent to act as lead supervisory authority for cross-border processing. For a company whose EU main establishment is in Ireland, that is the Irish authority — a national regulator, not an EU body.

How to keep them apart. The EDPB is a coordination and consistency body: it issues guidelines, resolves disputes between authorities and runs the consistency mechanism. Day-to-day supervision and enforcement of a specific controller sits with a national authority. When a GDPR question asks "who is competent", the answer is usually a national regulator; when it asks "who ensures consistent application across the Union", it is the EDPB.

Digital Services Act: who supervises the very large platforms?

(88% of wrong answers chose "European Data Protection Board".) Under Article 56 of the DSA (Regulation (EU) 2022/2065), the Commission has exclusive powers to supervise and enforce the additional obligations that apply to very large online platforms and very large online search engines, while the Digital Services Coordinator of establishment handles the rest. The EDPB does not appear in this architecture at all — it belongs to data protection, a different regime.

How to keep them apart. Match the regulator to the regulation, not to the industry. "Big tech company" is not a legal category. Data protection means supervisory authorities and the EDPB; platform obligations mean Digital Services Coordinators and the Commission; competition means the Commission's DG COMP; digital-market gatekeeping means the Commission under the DMA.

Digital Markets Act or Digital Services Act?

Gatekeeper obligations (88% of wrong answers chose "Digital Services Act"). Ex ante obligations on designated gatekeepers providing core platform services come from the Digital Markets Act (Regulation (EU) 2022/1925), whose Article 3 sets out the designation criteria. The DSA governs illegal content, transparency and platform accountability — a different problem entirely.

How to keep them apart. Learn the one-word purpose of each act and the word that triggers it. DMA → contestable and fair markets; trigger word "gatekeeper". DSA → safe online environment and illegal content; trigger word "very large online platform". If the stem contains "gatekeeper" or "core platform service", it is the DMA regardless of how familiar the DSA sounds.

Is the target binding law or a political commitment?

Climate neutrality by 2050 (88% of wrong answers chose "the Paris Agreement"). The target became binding on the Union through the European Climate Law (Regulation (EU) 2021/1119). The Paris Agreement is an international treaty the EU is party to, but it is not the instrument that made the EU's own 2050 objective legally binding, and the European Green Deal is a Commission communication — a policy package, not a legal act.

How to keep them apart. When a question asks which instrument "made X binding", sort the candidates by legal form before you think about content: regulation and directive are binding law; a European Council conclusion or a Commission communication is not; an international agreement binds the Union externally but is rarely the answer to "which EU instrument imposed this obligation internally". The instrument with a year and a number in its name is usually the one you want.

General Court or Court of Justice?

Appealing a Commission competition fine (86% of wrong answers chose "a direct appeal to the Court of Justice"). An action for annulment against a Commission decision brought by the addressee company goes to the General Court first; only then can there be a further appeal to the Court of Justice, and Article 256 TFEU limits that appeal to points of law only.

How to keep them apart. Direct actions by companies and individuals start at the General Court. The Court of Justice handles preliminary references from national courts, actions between institutions and Member States, and appeals on points of law. "It is an EU court" is not a discriminating feature; who is suing whom is.

When does the Charter of Fundamental Rights bind Member States?

(85% of wrong answers chose "all actions of Member States".) Article 51(1) of the Charter addresses it to the institutions, bodies, offices and agencies of the Union, and to the Member States only when they are implementing Union law. It is not a general national bill of rights.

How to keep them apart. Scope questions have a characteristic trap: the distractor is the same statement with the qualifier removed. Whenever an option sounds like the correct answer but says "all", "always", "only", or "any", check whether the source text carries a limiting clause. In EU knowledge questions it usually does, and the unqualified version is the magnet.

AI Act: high risk or unacceptable risk?

Which category is prohibited (90% of wrong answers chose "high-risk AI systems"). High-risk systems are permitted subject to heavy compliance obligations. It is the practices in the unacceptable-risk category that are banned outright, listed in Article 5 of the AI Act (Regulation (EU) 2024/1689), which opens "The following AI practices shall be prohibited".

How to keep them apart. Where a regime has a ladder of tiers, the distractor is nearly always the rung next to the right one, and the strongest word in the stem tells you which rung: "prohibited" and "banned" point at the top rung; "conformity assessment", "obligations", "requirements" point at the rung below it.

Which treaty article is the legal basis?

Legal basis of the common commercial policy (100% of wrong answers chose "Article 114 TFEU"). The common commercial policy sits in Article 207 TFEU, in Part Five of the Treaty — the Union's external action. Article 114 TFEU is the internal-market harmonisation basis, which is the right answer to a great many other questions and the wrong answer to this one.

How to keep them apart. Learn treaty articles by the part of the Treaty they live in, not as isolated numbers. External action, internal market, area of freedom security and justice, institutional provisions, financial provisions: place the topic in a part first, and most of the wrong numbers disappear before you have to remember anything.

How should this change the way you study?

Four things follow from the pattern, and none of them require our platform to apply:

1. Study confusable pairs, not isolated facts. The evidence says you will not lose marks because you have never heard of the European Climate Law. You will lose them because the Paris Agreement was also in the room. Learn things in the pairs and ladders they get confused in.
2. When you get one wrong, write down which option you chose. "Got it wrong" is not diagnostic information. "Chose the Commission where the answer was the Council" is, and it predicts the next twenty questions you will get wrong.
3. Sort candidate answers by legal form before content. Regulation, directive, decision, communication, conclusion, international agreement, treaty article — a large share of the concentrated errors above dissolve at this step, before you need to recall any substance.
4. Distrust the option that feels most familiar. Our reading of this data is that familiarity is precisely the mechanism: the magnet answer is a well-known correct entity in the wrong context. If an option feels obviously right and the question looks too easy for the exam, that is the moment to reread the stem for the qualifier.

What this data does not say

Some honest limits, because a number without its caveats is not worth citing:

• This is our practice bank, not the EPSO test. It is built to resemble the official EU knowledge test in format and topic coverage, but we make no claim about the composition of the real exam and we have no access to it.
• Some concentration is designed in: a good multiple-choice question deliberately includes a plausible near-miss. The measurement shows the near-miss works; it cannot separate "candidates hold this specific misconception" from "this specific distractor is well written". Both readings lead to the same study advice.
• The people answering are self-selected candidates practising, not a random sample of AD5 applicants, and they answer under practice conditions rather than exam conditions.
• Percentages are a snapshot. They move as more answers come in, which is why every figure here carries the date of the run.

How to check us

The measurement is a single query over the question bank, and the recipe is short enough to state in full: take every active EU knowledge question; keep the ones with at least ten recorded wrong answers (448 of 1,371); for each, compute the share of its wrong answers taken by its most-chosen incorrect option; count how many exceed 60% (161). For the baseline, model each question's wrong answers as independent draws over that question's incorrect options and sum the resulting probabilities (12.9). Run date: 13 August 2026, 00:11 CEST.

If you want to replicate the logic on your own practice history, the comparison that matters is the same one: not how many you got wrong, but whether your wrong answers keep landing on the same kind of option.

Where to practise this

If you want to work through EU knowledge questions built around these confusable families — and to see which distractor you personally keep falling for — you can start with a free diagnostic; the practice section reports which option you chose, not just whether you were right. If you would rather read than drill, our EU knowledge ebook and audiobook The Story of the Union covers the same material in narrative form. Our guide on what to study for the AD5 EU knowledge test covers the topic list, and the answers to the questions AD5 candidates are asking right now covers the procedural side.

Either way, the finding stands on its own: in EU knowledge, your errors have a direction. Find out what yours is.

Figures in this article are from the Pass EPSO EU knowledge question bank as of 13 August 2026 and describe our own practice data. Pass EPSO is an independent preparation platform and is not affiliated with EPSO, EU Careers or any European Union institution or body.