The "Error Carried Forward" Hack: How to Get Marks Even When You're Wrong
Picture the scene: You’re in the exam hall. You turn the page to a big, nasty 5-mark algebra question. You start confident, but on line two, your brain freezes. You panic. You scribble something down that you know is probably wrong.
At this point, most students think: "Well, that’s it. I’ve messed up the first part, so I’m going to get zero for the whole question." They put their pen down and give up.
Stop. Pick the pen back up.
In the UK exam system (whether that’s AQA, Edexcel, or OCR), the idea that "Right Answer = Marks" and "Wrong Answer = Zero" is a total myth for long form questions. The reality is much friendlier, provided you know the secret codes of the mark scheme.
Here is your guide to “M1” meaning, error carried forward marks, and how to scrape points from a question even when you’ve messed up the calculation.
Common student frustration
Decoding the Secret Code: What Does 'M1' Mean?
If you look at a mark scheme, you’ll see letters next to the numbers. The most important one for you is M1.
M stands for Method.
An M1 mark means: "This student knows the correct mathematical process to solve the problem." It does not mean you got the right answer.
The Hack:
Imagine a question asks you to use the quadratic formula.
- Student A tries to do it all in their head, makes a mistake, and writes down "x = 5". Score: 0 marks.
- Student B writes down the full formula, substitutes the numbers in correctly, but types it into their calculator wrong and gets "x = 5". Score: M1 awarded.
Action Point: Always writes the formula or the method first. Even if your arithmetic falls apart later, that first line is often "free money."
The Life Saver: Error Carried Forward (ECF)
This is the best-kept secret in exams. It is technically called Error Carried Forward, but you can think of it as the "Pity Point" or the "Safety Net."
Let's say a question has two parts:
- Part A: Calculate the area of the circle base (2 marks).
- Part B: Use your answer from Part A to calculate the volume of the cylinder (3 marks).
Scenario: You totally mess up Part A. You calculate the area as 10, but the real answer is 50. You get 0 marks for Part A. Is Part B doomed?
No.
If you take your wrong answer (10) and use it correctly in the method for Part B (multiplying it by the height), the examiner must give you the marks for Part B. They treat your wrong number as if it were right for the rest of the question.
The Hack:
Never leave a follow-up question blank just because you couldn't do the first part. If you are stuck on Part A, make up a number (e.g., write "Let Area = 10") and use that number to solve Part B. You will lose the marks for A, but you can still get full marks for the logic in B.
Why Our AI Loves Your Working Out
You might think that because we use AI to mark papers, it works like a scantron machine where it’s only looking for the final tick in the box.
Actually, it’s the opposite. ExamGPT is trained specifically to read your steps, not just your destination. It is programmed to hunt for those M1 marks and spot Error Carried Forward trails.
It scans your working to see if you applied the right logic, even if the final number is a disaster. But here is the catch: The AI can’t give you marks for working that stays inside your head.
Help the human examiner and the AI help you. Get it on the page.
Summary Checklist (The Cheat Sheet)
Next time you are stuck on a mock paper, run this mental checklist to maximize your score:
- Write the Formula? ✅ (M1 banked instantly)
- Show the Substitution? ✅ (M1 banked for putting the numbers in the right place)
- Got the Final Number Wrong? ❌ (A1 accuracy mark lost...)
- Used that wrong number correctly in the next part? ✅ (Full marks for ECF!)
Final Score: 3/4 marks.
You just got a Grade 7 answer with a Grade 3 calculation. That is why you show your working.
Want to check if you’ve secured the M1 mark before the exam?
Imagine snapping a photo of your maths homework and knowing instantly if you’d get the method marks, even if you got the final answer wrong.
We are launching the ultimate revision tool in January 2026. It doesn’t just give you the answer; it marks your working out like a real examiner.