How to Use IB Mark Schemes to Score Higher
An IB mark scheme is the document examiners follow to award every mark on a paper. Used well, it shows you exactly what a full-mark answer contains. Use it in three steps: learn its notation, mark your own answers strictly against it, then turn each lost mark into a specific revision task. This guide walks through all three, with examples from IB Biology, Chemistry, Physics and Maths.
TL;DR
- A mark scheme is written for one specific paper and tells examiners how to split the total mark across a response.
- Learn the notation (slashes, brackets, underlining, M, A, R and FT marks) before you self-mark.
- Mark positively, award whole marks only, and never credit an answer that contradicts itself.
- Log every lost mark by cause, then practise that weakness with fresh questions.
- Always check that the scheme matches your paper, level and exam session.
Table of Contents
- What an IB mark scheme actually is
- Why the scheme is consistent from examiner to examiner
- How to read the notation
- Reading the question the way the scheme does
- A strict method for self-marking a past paper
- Common mistakes when marking yourself
- Turning lost marks into a revision plan
- Where to find the right mark scheme
- Our perspective: practise on the scheme, not around it
- Practise with examiner-written questions
- FAQ
- Sources
What an IB mark scheme actually is
The IB describes a markscheme as an analytic scheme prepared for a specific examination paper, giving examiners detailed instructions for breaking down the total mark across the parts of a response. It is not a model essay. It is a list of the points that earn credit.
It also differs from a markband. A markband describes expected performance through level descriptors and is judged on a best-fit basis. Extended tasks such as essays and some written responses lean on markbands, while short and structured questions lean on mark schemes with point-by-point credit.
This matters because the two need different habits. With a mark scheme, you ask: “Which creditable points did I make?” With a markband, you ask: “Which descriptor does my whole answer best fit?”
Why the scheme is consistent from examiner to examiner
The IB wants a student to receive the same result whichever examiner marks the script. Before marking begins, a standardization meeting is held where the principal examiner, supported by senior examiners, sets the marking standard. The principal examiner decides what the right answer is and how marks are given, and other examiners follow those views.
For you, this is reassuring. The scheme is applied literally and fairly. Examiners are not hunting for reasons to take marks away, and they cannot reward vague answers that merely sound clever.
How to read the notation
Most lost marks in self-marking come from misreading the shorthand. These conventions come from an official IB Physics markscheme:
| Symbol | What it means | What you should do |
|---|---|---|
| Slash (/) | Alternative acceptable wording or answers | Accept any one of them |
| Brackets | Words not necessary to gain the mark | Do not penalise if missing |
| Underlined word | Essential to the mark | Treat as compulsory |
| WTTE | Words to that effect | Accept clearly equivalent meaning |
| FT | Follow through | Credit correct working from an earlier error |
Maths papers add their own marks. In an IB Mathematics: analysis and approaches markscheme, M marks are for a correct method attempt, A marks are for accuracy (and depend on the M mark), R marks are for clear reasoning, and AG means the answer was given in the question, so you must show the working that gets there.
The underlined-word rule catches students most often. If the scheme underlines “complementary” in a base pairing answer, “matching” will not do. Terminology is part of the mark.
Reading the question the way the scheme does
The scheme is written to answer the command term. The IB links command terms to assessment objectives: in its Computer Science guide, for example, Define and State sit at objective 1, Apply and Describe at objective 2, and Analyse, Discuss, Evaluate, Explain and Justify at objective 3. The same logic applies across the sciences, since each subject guide defines its own terms.
In practice, “State” earns a mark for a short fact, while “Explain” usually needs a cause and a consequence, each credited separately. Count the marks, count the distinct points in the scheme, and you will see how much depth the question wants. Our guide to IB command terms for science and maths covers the full set.
A strict method for self-marking a past paper
Self-marking only helps if it is honest. Follow this routine.
- Finish the paper under timed conditions. Mark nothing until you have stopped the clock.
- Use a different colour pen. It shows at a glance what you wrote and what you added afterwards.
- Mark positively. Examiners are told to give credit for correct achievements rather than deduct marks for incorrect responses or spelling errors.
- Award whole marks only. There are no half marks.
- Apply follow-through. If you used a wrong answer correctly in a later part, the scheme usually still credits that part.
- Check for contradictions. Contradictory information within one answer prevents the mark being awarded, even when a correct point sits beside it.
Follow-through is worth slowing down for. Many students lose confidence after an early slip in a multi-step calculation, yet the scheme often rewards the method that came after it. If you want to trace how credit carries through a chain of working, highlighting and annotating passages of the scheme as you mark makes it easy to reopen the exact line later.
For a fuller walkthrough, see our six-step examiner workflow for self-marking IB science answers.
Common mistakes when marking yourself
- Giving credit for the “gist”. If the scheme underlines a term, the gist is not enough.
- Ignoring FT rules. You may undermark yourself and misjudge your real level.
- Marking generously because you “knew it”. Examiners can only mark what is written.
- Leaving contradictions unchecked. A final sentence that undoes your earlier point can cost the mark.
- Reading the scheme before attempting the question. You then learn nothing about your own recall.
Turning lost marks into a revision plan
A total score tells you little. A log of lost marks tells you everything. For each lost mark, write one line with three details: the topic, the cause and the fix.
Causes usually fall into four groups:
- Knowledge gap: you did not know the content.
- Terminology: you knew it but used the wrong word.
- Command term: you answered a different question from the one asked.
- Technique: a calculation slip, units, significant figures or timing.
After two or three papers, patterns appear. Perhaps half your lost marks in Biology Paper 2 are terminology, which you fix with flashcards. Perhaps your Chemistry losses cluster in one topic, which you fix with targeted questions. Then space the reviews: a sensible spaced repetition schedule brings weak points back before you forget them. Our guide to analysing IB mock results shows how to run this over eight weeks.
Where to find the right mark scheme
Only use a scheme that matches your paper exactly. Check four things before you mark:
- The subject and level (SL or HL).
- The paper number and, for some subjects, the time zone variant.
- The exam session (May or November) and year.
- The syllabus, since subjects with a recent first-assessment year have older and newer papers that differ.
Your teacher or IB coordinator can usually share official past material, and the IB’s own site publishes sample and specimen assessment material. If a scheme you find online lacks a clear session label, treat it with caution.
Our perspective: practise on the scheme, not around it
We see the same pattern again and again. Students who improve fastest are not those who do the most papers. They are the ones who mark each paper strictly and then act on what they find. A mark scheme is a conversation with an examiner, and it is only useful when you listen to all of it.
That is why Tiber Tutor is built around the mark scheme. Our exam-style questions and resources are written by actual IB examiners, so the wording, the mark allocation and the answer points mirror what you will meet in the real exam. Each question links to its notes, animated videos and flashcards, so a lost mark leads straight to the fix. Student-led answer review sits beside examiner mark schemes, and our performance tracking shows where marks are going across topics. We have not found this combination of integrated tracking and examiner-written content anywhere else for IB STEM.
You are closer than you think. Every lost mark you find now is a mark you can win in May.
— Oliver
Practise with examiner-written questions
If you want questions and mark schemes that behave like the real thing, try Tiber Tutor. You get exam-style questions, topic tests and mock exams for IB Biology, Chemistry, Physics and Maths, with progress tracking that shows your weakest topics. Start with the free 7-day trial, then choose the Per-Subject Plan at $9 per month or the All-Access Plan at $19 per month. Because the content is written by IB examiners and everything is in one place, it is the best-value way to prepare. See the pricing page to compare plans.
You can also browse IB Chemistry mock exams or IB Biology tests first.
FAQ
Should I read the mark scheme before attempting a paper?
No. Attempt the questions first under timed conditions, then mark. Reading the scheme beforehand hides your real gaps. Use it before an attempt only when you are learning a brand new topic and want to see what the exam expects.
Do examiners deduct marks for spelling mistakes?
Examiners are instructed to mark positively and not to deduct marks for spelling errors. The catch is that the term must still be clearly the right one. A misspelling that changes the meaning, or one that leaves a required term unclear, will not earn the mark.
What does follow-through mean on an IB mark scheme?
Follow-through (FT) means you can still earn marks in a later part when you correctly use an incorrect answer from an earlier part. Look for the FT note beside the relevant line and check your working. It is a common source of marks that students forget to claim.
How is a mark scheme different from a markband?
A mark scheme gives point-by-point credit for a specific paper. A markband uses level descriptors and a best-fit judgement for the whole response. Expect the first on short and structured questions, and the second on extended tasks.
Sources
- IB Computer Science guide: markschemes and markbands
- IB Computer Science guide: command terms
- IB assessment guide for teachers and coordinators
- IB guide to assessment for examiners
- IB Mathematics: analysis and approaches HL Paper 1 markscheme
- IB Physics markscheme, May 2022
- Highlighting and annotating passages
- Spaced repetition schedule