IBDP Core • Extended Essay • Written by the PrepSeven Editorial Team, reviewed by certified IB Examiners

Common IB Extended Essay Mistakes Students Should Avoid (and How to Fix Them)

Every May and November session, examiners read thousands of Extended Essays that are competently written, reasonably well researched, and still land in the C or D markbands rather than the A range. What separates them from the top-scoring essays is rarely raw ability. It’s almost always a small set of recurring, fixable mistakes — structural choices made in the first few weeks of the process that quietly cap the essay’s ceiling long before the final draft is even written. This guide breaks down the ten mistakes PrepSeven’s examiner-tutors see most often, explains exactly why each one costs marks against the official criteria, and gives you a concrete way to fix or avoid it.

Why Most EE Mistakes Are Structural, Not About Writing Talent

It’s worth saying this clearly up front, because it changes how you should approach revision: an Extended Essay is not primarily judged on how elegantly you write sentences. It’s judged against five specific criteria — Focus and Method, Knowledge and Understanding, Critical Thinking, Presentation, and Engagement — each with its own markbands and its own failure modes. A beautifully written essay built on an unanswerable research question will still score poorly under Criterion A, no matter how good the prose is. A grammatically simple essay that argues rigorously and engages honestly with its own limitations can outscore a more ‘polished’ one. Keeping this in mind reframes editing: you’re not proofreading for style, you’re auditing your essay against a rubric.

Mistake 1: An Unfocused or Overly Broad Research Question

This is, by a significant margin, the single most common root cause of a disappointing EE grade — and it’s almost always identifiable in the very first sentence of the essay. A question like ‘What is the impact of climate change on agriculture?’ sounds substantial, but it gives you no way to bound your research. Which crops? Which region? Which time period? Impact measured how? Without answers to these questions built into the research question itself, students end up either writing a shallow survey of an enormous topic, or discovering three-quarters of the way through that they’ve actually only gathered evidence for a much narrower argument than the one their title promises.

Mistake 2: Descriptive Writing Instead of Analytical Argument

Criterion C — Critical Thinking — is worth 12 of the EE’s 34 marks, more than a third of the total, and it is exactly where description-heavy essays lose the most ground. A telltale sign: if you can summarise an entire paragraph as ‘this paragraph explains what X is and what happened,’ it’s descriptive. If the paragraph is instead built around ‘this evidence suggests Y, though it’s complicated by Z, which means…’, it’s analytical.

Consider the difference between two sentences that might appear in a History EE on economic causes of a revolution:

Descriptive: “Bread prices rose sharply in 1788 and 1789, causing widespread hardship among the Parisian population.”

Analytical: “While bread price inflation is often cited as the primary trigger of the October Days, contemporary wage records suggest that real income had already been eroded by stagnant wages since 1785 — implying that price shocks acted as a catalyst for pre-existing economic grievances rather than their root cause.”

The second version does everything the first one does, plus it interprets the evidence, positions itself against a common explanation, and draws a specific analytical conclusion. That’s the shift examiners are rewarding under Criterion C, and it’s a habit you can train by asking ‘so what does this evidence actually prove?’ after every factual statement you write.

Mistake 3: Ignoring Counterarguments and Alternative Interpretations

Many students structure their EE as a single, uninterrupted case for their own thesis, treating any evidence that complicates their argument as something to leave out rather than address. Examiners read this as a lack of critical distance. The strongest essays actively seek out the strongest available counter-evidence or alternative interpretation and then explain, with reasoning, why their own argument still holds — or how it needs to be qualified in light of that evidence. This single habit, done consistently through the body of the essay, is one of the fastest ways to move from the middle to the top Criterion C markband, because it demonstrates the kind of intellectual honesty examiners are specifically trained to look for.

Mistake 4: Treating the RPPF as an Afterthought

The Reflections on Planning and Progress Form is worth 6 marks under Criterion E — the same weight as your entire conclusion — yet it’s routinely written in the final 48 hours before submission, often as a rushed summary of ‘what I did.’ Examiners can tell immediately when reflections were written retrospectively as a formality rather than genuinely at each stage of the research process. Weak RPPF entries tend to be generic (‘I learned a lot about time management’) rather than specific (‘after my first round of interviews returned inconclusive results, I revised my sampling method to include…’). Strong reflections name specific decisions, specific obstacles, and specific changes in thinking — which is only possible if you’re actually reflecting as you go, not reconstructing the process from memory afterward.

Mistake 5: Poor Time Management and Last-Minute Writing

The EE is typically assigned across twelve or more months precisely because good research takes time to develop, and most of the mistakes on this list — vague questions, descriptive writing, weak reflections, shallow engagement with sources — are symptoms of essays written under last-minute time pressure rather than any lack of ability. A student who starts serious research two weeks before the deadline is structurally unable to iterate on their research question, seek out counterarguments, or reflect meaningfully at multiple points in the process, regardless of how strong a writer they are.

• Set your own internal deadline: aim to have a complete first draft at least six weeks before your school’s deadline, leaving real time for revision rather than just proofreading.
• Schedule reflection sessions in advance: book your three required supervisor meetings early in the term rather than scrambling to fit them in near the deadline.
• Draft in stages, not all at once: write your body sections as your research develops, rather than waiting to write anything until ‘all the research is done.’

Mistake 6: Inconsistent or Incorrect Citation Practice

Presentation (Criterion D) is worth only 4 marks, which leads some students to treat it as low-priority — but inconsistent referencing does more damage than its raw mark weight suggests, because it also raises academic honesty concerns that can affect how the rest of the essay is read. Common issues include switching between citation styles partway through, citing some claims but not others of similar specificity, and failing to distinguish clearly between a paraphrase and a direct quotation. Pick one citation style (MLA, APA, or Chicago, depending on your subject and school preference) before you write a single sentence of your first draft, and use a reference manager or a running bibliography document from day one rather than trying to reconstruct your sources at the end.

Mistake 7: Padding the Essay With Unnecessary Background Information

Faced with a 4,000-word limit, some students fill the early sections of their essay with broad contextual background — general history of a country, a textbook explanation of a scientific concept, a full biography of an author — well beyond what’s needed to understand the specific argument that follows. This isn’t just an inefficient use of words; it actively works against Criterion C, because pages spent on general context are pages not spent on analysis. As a rough test: if a paragraph could be deleted without weakening your actual argument, it’s probably padding and should either be cut or moved to a footnote.

Mistake 8: Choosing a Topic With No Realistic Access to Data or Sources

This mistake is made almost entirely at the topic-selection stage, months before the actual writing begins, which is exactly why it’s so damaging — by the time it becomes obvious, there’s often little time left to change direction. A History EE that depends on untranslated primary sources in a language the student doesn’t read, a Psychology EE that would require running an experiment with vulnerable populations no school ethics process would approve, or a Business Management EE built around a private company that refuses to share the financial data needed — all of these are avoidable if feasibility is checked before the topic is finalised, not after weeks of frustrated research.

Mistake 9: Ignoring Subject-Specific Conventions

Each subject group carries its own expectations for what a ‘good’ EE looks like structurally, and applying the wrong template is a quieter but still costly mistake. A Sciences EE without a clear methodology section, a History EE that doesn’t engage with historiography (differing interpretations by historians), or a Literature EE that never closely analyses actual passages of text will all read as slightly off to an examiner marking against that subject’s specific guide, even if the general academic quality of the writing is fine. Read your specific subject’s EE guide (available through your supervisor) rather than assuming the general EE structure applies identically everywhere.

Mistake 10: Academic Honesty Violations, Including Unintentional Plagiarism

Most plagiarism issues in EEs aren’t deliberate cheating — they’re the result of sloppy note-taking during research, where a paraphrase drifts too close to a source’s original wording, or a citation is simply forgotten under time pressure. The consequences are serious regardless of intent: essays found to include unattributed material can be awarded a mark of zero, and in more serious cases can put the entire Diploma at risk. Keep a running research log from the very first source you read, note page numbers and exact quotations as you go, and when in doubt, cite it — over-citing is a far smaller problem than under-citing.

How Examiners Read a Weak Essay Versus a Strong Essay

It’s useful to picture the difference in how an examiner actually experiences these two essays, since it’s rarely about isolated errors and more about a general impression built paragraph by paragraph.

• A weak essay: opens with a broad, unfocused question; spends its first third on general background; presents evidence in roughly chronological or textbook order without much interpretation; avoids counterarguments; and closes with reflections that read like a diary entry written the night before submission.
• A strong essay: opens with a precise, clearly bounded question; moves quickly into evidence and argument; actively engages with alternative interpretations and explains why its own argument still stands; and closes with reflections that name specific turning points in the student’s thinking, showing a research process that genuinely evolved over time.

A Pre-Submission Checklist

Run through this list before you submit your final draft:

1. Is my research question specific enough that a stranger could tell what evidence I’d need to answer it?
2. Does my introduction state the research question explicitly and explain why it matters?
3. Have I checked every paragraph for description-only content and added a ‘so what’ interpretation where needed?
4. Have I engaged seriously with at least one strong counterargument or alternative interpretation?
5. Is my citation style consistent from the first page to the last?
6. Have I cut background information that doesn’t directly serve my argument?
7. Does my conclusion directly answer my research question, rather than just summarising the body?
8. Have I honestly discussed the limitations of my method or evidence?
9. Were my RPPF reflections written close to each actual research stage, with specific details rather than generalities?
10. Have I checked my word count against the official limit, including or excluding the sections IB specifies?

How PrepSeven Helps You Avoid These Mistakes Before They Happen

PrepSeven’s tutors are certified and former IB examiners who have personally marked hundreds of Extended Essays across every subject group, which means we’re not guessing at what examiners reward — we know, because we’ve done the marking ourselves. Rather than a single read-through at the end, we work with students at each stage: topic feasibility, research question refinement, structured supervision through drafts, and a full criterion-by-criterion review before submission, catching exactly the kind of structural issues covered in this guide while there’s still time to fix them.

Frequently Asked Questions

Q1. What are the top reasons IB Extended Essays lose the most marks?

An unfocused research question, descriptive rather than analytical writing (Criterion C), weak engagement with counterarguments, and rushed, generic RPPF reflections are the four issues examiners report seeing most consistently across underperforming essays.

Q2. Is it too late to fix a weak research question if I’ve already started writing?

It’s rarely too late, and it’s almost always worth doing. Narrowing an overly broad question — even midway through your first draft — usually saves more time than it costs, because it focuses your remaining research and analysis instead of letting you continue down an unfocused path.

Q3. How important are the RPPF reflections compared to the essay itself?

The RPPF is worth 6 of the EE’s 34 marks under Criterion E, roughly the same weight as your entire introduction and conclusion combined — significant enough that treating it as an afterthought measurably lowers your final grade.

Q4. What’s the single fastest way to improve a first draft?

Go through every paragraph and ask ‘have I only described something here, or have I actually interpreted it?’ Adding an interpretive sentence after key evidence is usually the highest-leverage single edit you can make.

Q5. How strict is the IB about word count limits?

The word count is a hard limit, and examiners are instructed to stop reading (or disregard content) beyond it. Always check the current official word count rules with your supervisor, and build in a buffer rather than writing right up to the maximum.

Q6. Can a strong topic still result in a weak essay?

Yes — topic selection matters, but execution matters more. A strong topic paired with descriptive writing, a rushed RPPF, or inconsistent referencing can still land in the middle markbands, which is exactly why the mistakes in this guide matter regardless of how good your original idea was.

Q7. Should I show my draft to more than one teacher?

Your official supervisor is who assesses your reflections and signs off on your process, but a second, subject-expert read from a tutor who knows the EE criteria in detail can catch issues your supervisor may not have time to flag in depth.