Correcting Mistakes From a Returned Test — the Right Way
Most students, when a marked test comes back, do the same thing: look at the score, glance at the correct answer next to the wrong one, nod, and move on. That is recognition, not correction, and it is why the same mistake so often reappears a few weeks later on a different test covering the same topic. Recognising a correct answer on a page you are already looking at and producing that same answer from a blank page later are two completely different skills.
This is a routine worth applying to every test, not just the bad ones — a small, careless slip on an otherwise strong paper is just as worth logging as a larger gap on a weak one, because the point is not the score, it is catching the specific error before it repeats.
The rule
The correction routine, step by step
- Read the actual comment or mark-scheme note next to the mistake, not just the score at the top of the page. The comment usually names the specific issue — "unbalanced equation", "wrong sign", "missing unit" — far more precisely than the score does.
- Cover the correct answer and attempt the question again, closed book, from scratch. Do this before looking at the marked solution a second time.
- Only then compare your redo against the correct answer or mark scheme.
- Write one honest sentence about what specifically went wrong — a fact you did not know, a step you skipped, a careless slip, or a misread question. Vague notes like "silly mistake" are not specific enough to prevent a repeat.
- Add it to a running mistake log for the term, not just a note in the margin of that one paper.
Worked through, on a real slip
A wrong numerical answer, corrected properly
A student calculates the molarity of a solution made by dissolving 4.0 g of NaOH in enough water to make 250 mL of solution, and writes 1.0 mol/L. The correct value is 0.4 mol/L. Copying the correct number into the notebook and moving on would be recognition, not correction.
The redo, closed book: moles of NaOH = mass ÷ molar mass = 4.0 g ÷ 40.0 g/mol = 0.1 mol. Volume = 250 mL = 0.25 L. Molarity = moles ÷ volume in litres = 0.1 ÷ 0.25 = 0.4 mol/L. Redoing it from scratch, the student gets the correct answer this time — the working reveals that the original error was using 250 (mL) directly as the volume in litres instead of converting it first.
The one-line log entry: "Molarity — used mL directly instead of converting to L before dividing. Always convert volume to litres first, every time, before the division."
That single sentence, reviewed briefly before the next molarity question on a future test, is what actually prevents the repeat — not the correct number sitting unread in an old notebook.
A sample mistake log across a few tests
| Date | Question/Topic | What went wrong | One-line fix | Reviewed before next related test? |
|---|---|---|---|---|
| 3 Sep | Molarity numerical | Used mL directly instead of converting to L | Always convert volume to litres before dividing | Yes — no repeat on 24 Sep test |
| 10 Sep | Equilibrium — Le Chatelier | Correctly stated the shift but forgot to explain why | Always add the one-line "because…" reasoning, not just the direction | Yes |
| 17 Sep | Organic — nomenclature | Misnumbered the longest chain, picked the wrong parent chain | Check for the longest chain through a substituent, not just visually the longest line drawn | Not yet — due before next test |
This log is different from a weekly confidence-and-score tracker — it is a running list of specific errors and their one-line fixes, reviewed just before the next test that touches a related topic, rather than a broader weekly record of how a whole chapter is going.
When correction alone is not enough
If the same TYPE of mistake keeps appearing across several tests despite being logged and reviewed each time, that is a signal the gap is bigger than a single careless slip — it points to a genuine misunderstanding worth a more structured, dedicated repair, the kind a focused recovery plan is built for, rather than another one-line log entry.
What goes wrong
- Just copying the correct answer into your notebook. Recognition is not correction; the next similar question tests whether you can produce it, not whether you remember seeing it.
- Not reading the teacher's actual written comment. It is usually the most specific and useful clue on the page, and it is easy to skip past straight to the score.
- Only correcting mistakes on bad tests. A small slip on a test you did well on is still worth logging — good scores hide individual errors just as easily as bad ones expose them.
- Letting the returned paper sit unread for weeks. The comments and your own memory of the question are freshest right after the test comes back.
- Keeping a log but never actually reviewing it before the next related test. A mistake log that is written but never reopened does not prevent a repeat.
- Treating every mistake the same way. A content gap, a careless slip and a misread question each need a different one-line fix — writing the same generic note for all of them defeats the purpose of logging specifically.
When redoing a numerical closed book, verify your final answer independently before logging the entry. That confirms whether the redo genuinely fixed the error or only produced a different mistake.
Open the ABC Chemistry Calculator Suite →If a mistake log keeps flagging the same type of error across several tests, structured teaching usually closes that gap faster than repeated self-correction alone. ABC Chemistry teaches Class 11–12 chemistry through live online across India, with regular tests that make a recurring pattern visible early — abcchemistry.in.