IBDP • Assessment & Exams • Written by the PrepSeven Editorial Team, reviewed by certified IB Examiners
How IB Exams Are Marked: Examiner Insights for Students
Most students spend two years preparing for IB exams without ever really understanding what happens to their paper after they hand it in. The process can feel almost mysterious — your script disappears into a system, and months later a grade appears. Understanding what actually happens in between isn’t just satisfying curiosity; it changes how you write your answers. Once you understand that examiners are trained on specific markschemes, working through defined mark points rather than forming a general impression, you start writing responses that are far easier to mark generously — because you’re making it obvious exactly where the marks are. This guide, from PrepSeven’s team of certified and former IB examiners, walks through the real mechanics of how your papers are marked.
Examiners Are Trained, Standardised, and Monitored — Not Working From Personal Judgement Alone
Every examiner marking IB scripts has gone through a formal recruitment and training process specific to that subject and paper. Before live marking begins each session, examiners attend standardisation meetings where they mark a shared set of sample scripts and compare their marks against the agreed standard set by senior examiners and the chief examiner for that subject. Any examiner whose marking drifts noticeably from the agreed standard during this process is retrained, given additional sample scripts, or in some cases not permitted to continue marking that session — the system is specifically designed to catch and correct inconsistent marking before it affects live student scripts.
How Markschemes Actually Work
For most IB papers, examiners work from a detailed markscheme developed alongside the exam paper itself, which breaks down exactly what earns credit for each question — sometimes as specific point-by-point criteria, sometimes as a levels-based markband descriptor for longer, more open-ended responses (essays, extended structured questions, oral commentaries). For objectively markable questions (a calculation, a short factual response), the markscheme is often close to a checklist. For extended-response questions, examiners instead place your response into a markband based on how fully it demonstrates the skills that band describes — meaning two structurally different answers can both score full marks if each demonstrates the same underlying qualities the markscheme is looking for.
Why This Matters for How You Structure Answers
If a question uses the command term ‘evaluate,’ the markscheme is very likely looking for a balanced discussion of strengths and limitations followed by a reasoned judgement — an answer that only describes or explains, however detailed, is working against a different set of mark points than the ones actually available. Learning to recognise what each command term is really asking the markscheme to reward is one of the highest-leverage exam skills available, precisely because it’s not really about content knowledge — it’s about hitting the specific structure examiners are trained to credit.
Anonymity and the Digital Marking Process
Scripts are marked without any information identifying you personally — examiners see only your candidate number, not your name or school, which is designed to prevent any conscious or unconscious bias based on knowing a specific student or school’s reputation. For most subjects, scripts are scanned and marked digitally through IB’s e-marking system, rather than physical paper being posted to examiners, which also allows for a specific quality-control mechanism worth understanding: seeded scripts.
Seeded Scripts and Ongoing Quality Monitoring
Throughout live marking, previously-marked ‘seed’ scripts (already agreed upon by senior examiners as representing a specific, confirmed mark) are quietly inserted into an examiner’s marking queue alongside live student scripts. If an examiner’s mark on a seed script falls outside an acceptable tolerance from the agreed mark, this flags a potential consistency issue, prompting review, retraining, or in persistent cases, having that examiner’s other marking checked and potentially adjusted. This ongoing monitoring, rather than a single training session at the start, is what allows IB to maintain consistency across potentially thousands of examiners marking the same subject worldwide.
Moderation for Internally Assessed Components
For components marked initially by your own school (like Internal Assessments and oral components in some subjects), the IB conducts a separate moderation process: a sample of scripts from each school is reviewed by an external IB moderator, who checks whether the school’s marking aligns with the required standard. If a school’s marking is found to be systematically too generous or too harsh compared to the standard, the IB can adjust that school’s marks in that subject up or down accordingly for the entire cohort — which is why understanding and applying the real criteria matters not just to you individually, but to how consistently your whole school’s marking is treated.
How Marks Convert Into Grades
Once all components (exams, and where applicable, IA marks) are combined into a total raw score for a subject, that total is converted into a final 1–7 grade using grade boundaries set specifically for that session (covered in detail in our companion guide on grade boundaries). This conversion happens after marking is complete and after senior examiners and IB’s assessment team have reviewed overall performance data for that session, which is why exact percentage-to-grade conversions can’t be known with certainty until after a specific session concludes.
What Examiners Wish Students Understood
- Vague answers are hard to credit generously, even when the underlying understanding might be there: examiners can only award marks for what’s actually written and demonstrated on the page, not for what they suspect you might know.
- Command terms are instructions, not decoration: ‘describe,’ ‘explain,’ ‘evaluate,’ and ‘discuss’ each point to a different kind of expected response, and misreading the command term is one of the most common, avoidable ways marks are lost.
- Longer isn’t automatically better: a concise answer that clearly hits every required mark point will outscore a much longer answer that circles the topic without precision.
- Showing your working matters in quantitative subjects: method marks are frequently available even when a final numerical answer is incorrect, provided your working clearly demonstrates the correct approach.
- Subject-specific vocabulary signals understanding efficiently: using precise terminology correctly is often the fastest way to demonstrate to an examiner, within a limited word or time budget, that you understand a concept properly.
Practical Exam Technique Based on How Marking Actually Works
- Identify the command term first: before answering, confirm exactly what type of response (describe, explain, evaluate, discuss, analyse) the question is asking for, and structure your answer to match.
- Use topic-specific vocabulary precisely: rather than approximate, everyday language, since precise terminology maps more directly onto markscheme language.
- Structure longer responses to make mark points easy to find: clear paragraphing or even brief signposting helps an examiner quickly identify where you’ve addressed each required element.
- Show full working in quantitative answers: even when you’re confident in your final answer, since method marks depend on your working being visible and correct.
- Don’t leave extended-response questions blank: markband-based marking often allows partial credit for a partially developed answer, which is always better than no attempt at all.
How PrepSeven Helps You Write Exam Answers Examiners Can Mark Generously
PrepSeven’s tutors are certified and former IB examiners who have personally marked exam scripts using the exact processes described in this guide. Rather than generic exam tips, we teach you to recognise what specific command terms are really asking for in your subjects, how to structure responses so mark points are unmistakable, and how to practice using real markschemes so you can self-assess accurately before exam day.
- Command term training specific to your subjects’ actual markscheme language
- Past paper practice marked against real IB markschemes by former examiners
- Structured feedback on exactly which mark points your responses are missing
- Exam technique coaching focused on how marking genuinely works, not generic advice
Frequently Asked Questions
Q1. Do IB examiners know which school or student they’re marking?
No — scripts are marked using only a candidate number, with no name or school information visible to the examiner, specifically to prevent any conscious or unconscious bias in marking.
Q2. Can I request a remark or review of my exam paper?
Yes, through your school’s official IB coordinator, there are formal enquiry upon results processes (including remarking requests) available within specific deadlines after results are released — your coordinator can advise on the exact current process and any associated costs.
Q3. What is a ‘seed’ answer in IB marking?
A seed script is a previously marked sample response, with an agreed confirmed mark, quietly inserted into an examiner’s live marking queue to check that their marking remains consistent with the standard throughout the marking period.
Q4. Are all IB papers marked digitally?
The majority of IB papers across most subjects are scanned and marked through IB’s e-marking system rather than physical scripts being posted to examiners, though exact processes can vary by subject and component.
Q5. How much do examiners rely on ‘partial credit’ for incomplete answers?
Quite significantly for extended-response and markband-based questions, and for method marks in quantitative subjects — a partially correct or partially developed answer very often earns some credit, which is why leaving a question blank is almost always a worse strategy than attempting a partial response.
Q6. Do examiners read my entire exam booklet, or just skim for keywords?
Examiners are trained to read full responses carefully against the markscheme, not simply scan for isolated keywords — though clear structure and precise vocabulary make it considerably easier for them to quickly and confidently identify where you’ve met each required mark point.
Q7. Why do command terms matter so much if I already understand the content?
Because marks are awarded for what’s actually demonstrated in the specific way the question asks for it — understanding content well but answering with the wrong type of response (describing when asked to evaluate, for example) means the markscheme’s actual mark points for that question often go unaddressed, regardless of how much you know.