How to Mark Your Own Past Paper Against a Mark Scheme

To mark your own past paper properly, use a different colour pen, go through the official mark scheme one marking point at a time, and give a mark only when the point is clearly on the page. The hard part is not the method. It is being as strict with your own script as an examiner would be with a stranger's.

This guide walks through the process, then shows a worked example of a three-mark question marked honestly.

Before you start

Finish the whole paper first, under conditions as close to the real thing as you can manage. Then:

1. Print or open the official mark scheme for the same paper and series, and check the paper number and version match yours.
2. Pick a pen in a colour you did not use for answering.
3. Read the front page of the scheme once. It explains the codes and any rules for that subject. If M1, A1, ecf or owtte are unfamiliar, read how Cambridge mark schemes work first.

Mark point by point, not answer by answer

Do not ask whether the answer is basically right. Ask which of the listed marking points are on the page.

For each question:

1. Read the mark total in brackets on the paper.
2. Read the marking points in the scheme. Write a small tick in your colour beside the exact words or working that earns each one.
3. Write the mark awarded next to the question, as a number out of the total.
4. Where you gave no mark for a point, note in the margin what was missing.

If you cannot point to a specific phrase or line that earns a mark, do not give it.

Be strict

An examiner cannot ask what you meant. Marks go to what is written. Cambridge mark schemes also say marks are awarded for what candidates clearly demonstrate, so the evidence has to be visible.

Some rules to apply to yourself:

• A vague point is not a point. "It gets faster" is not "the acceleration is constant" if the scheme wants the second.
• A contradiction cancels credit. In science schemes, a correct statement contradicted elsewhere in the same part does not score.
• Key words matter. If a word is underlined in the scheme, that word or a synonym must be there. For technical terms, the word itself is needed.
• No credit for the right idea in the wrong place. If the scheme wants the reason and you only described, mark it as described.

When your wording is different

Cambridge schemes often allow for this with "or words to that effect" (owtte) or "or equivalent" (oe). Compare meaning, not phrasing. Then ask two checks:

1. Does the scheme list a specific term, such as a named law or a technical word?
2. Could a reasonable examiner read your sentence without having to guess?

If the answer to the first is yes and you did not use it, you probably missed the mark. If you used different words with the same precise meaning, you probably scored it.

Alternative methods and follow-through

In mathematics, any correct method can earn credit unless the question specifies one. Your route may differ from the printed one, so check each of your steps. Do not assume your method is wrong or right because it looks different.

For follow-through, look for the abbreviations ft, ecf or "error carried forward" in the scheme. If your early value was wrong but you used it correctly later, you may be able to claim later marks. If the scheme says cao, you cannot. Do not award follow-through unless the scheme allows it for that part.

The places marks usually go missing

• Units. In Physics 0625 schemes, a missing or incorrect unit normally means the final calculation mark is not awarded unless the scheme says otherwise.
• Significant figures. If the question does not say how many, the scheme typically gives a value to compare to. Check what the scheme expects.
• Missing "because". An Explain answer that only describes loses the reason mark.
• A third point on a two-mark question. Extra correct points do not add marks, and a wrong extra one can contradict a right one.
• Rounding too early. In mathematics schemes this can cost the accuracy mark.

A worked example

This is an invented question in the style of a Cambridge science paper, and an invented answer.

Explain why a car travelling at constant speed needs its engine to keep working. [3]

Imagine the mark scheme has these points, any three of which gain a mark each:

1. There is air resistance or friction acting on the car.
2. The engine provides a forward force.
3. The forward force balances the resistive force.
4. If the forces were unbalanced, the speed would change.

The student wrote: "The car needs the engine because otherwise it would slow down. The engine pushes the car forward so it can keep going."

Marking honestly:

• Point 1: not on the page. The student never says what slows the car. No mark.
• Point 2: "the engine pushes the car forward". Clear and correct. Mark.
• Point 3: nothing about balance. "Keep going" is not a balance of forces. No mark.
• Point 4: "otherwise it would slow down" is close, but the scheme wants a link to unbalanced forces. Generous marking gives it. Strict marking says the cause is missing. No mark.

Total: 1 out of 3. It is tempting to give 2, because the student clearly understands the idea. But the marks are for the points, and two of them are not there.

The margin note reads: "Name the resistive force. Say forces balance." Rewrite the answer with those points before moving on.

Log your errors

Marking only helps if you use the result. Keep a simple table, on paper or in a notes app:

Group the reasons after each paper. If "no unit" appears four times, that is your next fix, and it costs nothing to practise. Then redo each lost-mark question a few days later without looking.

Avoid generous marking

• Mark the paper in one sitting so your standard does not drift.
• If you hesitate over a mark, give zero and flag it. You can change it later.
• Have a friend swap papers with you if you can. Reading someone else's script makes you naturally stricter.

When you cannot tell

Some answers genuinely sit on the line. Do not guess in your favour. Mark it as zero, put a question mark by it, and ask your teacher on the next occasion. You can also compare against the examiner report for that series, which discusses common answers and what did or did not score.

Let ExamPal do the point-by-point marking

If you would rather not mark by hand, pick a paper from the IGCSE Physics past papers or the past papers hub, write your answers by hand, and ExamPal reads your handwriting and marks it against the official mark scheme, showing where each mark came from, including follow-through. Reading papers, downloading PDFs and seeing mark schemes is free; a free account adds the AI marking. Not every paper or year is markable yet, so check the paper page first.