Revision works well when it is driven by your actual mistakes and kept inside the scope of your own syllabus. The method below has four parts: log, group, retest and check scope.
It assumes you already have a study route, so you know what to cover. This page is about what to do once the questions start coming back wrong.
Why log mistakes by skill, not by science?
A mark lost in Physics and a mark lost in Biology can come from the same habit. If you sort by science, you fix two separate topics. If you sort by skill, you fix one habit.
The mistake log and retest queue sorts entries into three kinds: arithmetic slips, interpretation errors and incomplete reasoning. Your notes stay on your own device.
How do I run the four steps?
- Log. After each question you get wrong, write the task, what you wrote, what was right, and one sentence on where your reasoning turned.
- Group. Once a week, group entries by the skill that failed.
- Retest. For each group, answer a fresh question on the same skill a few days later.
- Check scope. Before spending time on a fix, check that the skill is in your syllabus at that depth.
Worked example
A student logs three entries.
| Entry | Science | Question | What was written | What was right | Kind |
|---|---|---|---|---|---|
| A | Biology | A leaf loses 0.8 g of water in 20 minutes. Find the rate. | 4 g per minute | 0.8 ÷ 20 = 0.04 g per minute | Arithmetic (decimal place) |
| B | Physics | A runner covers 120 m in 15 s. Find the speed. | 120 × 15 = 1800 m/s | 120 ÷ 15 = 8 m/s | Interpretation (wrong operation) |
| C | Chemistry | Why does the mass of a burned metal rise? | “Because it is heavier now” | Oxygen from the air joined the metal | Incomplete reasoning |
Entries A and B look unrelated, but both ask for a change divided by the time taken. Grouped by skill, they form one group: “rate means change ÷ time”.
The fix is one short sentence written at the start of the next page: “rate = change ÷ time, then check the unit”.
The retest is a fresh question a few days later: a reaction gives off 36 cm³ of gas in 4 minutes, so the rate is 36 ÷ 4 = 9 cm³ per minute. If the student gets this right unaided, the group moves to “secure” on the grid.
Entry C needs different work. The chemical reasoning lessons practise naming what happened to the particles before writing a conclusion.
How do I keep revision in scope?
Separate-science books and videos can be useful, and they can also go further than your course. For each source, compare its statements with your syllabus and mark them in scope, out of scope or unclear.
Time spent on out-of-scope material is time taken from a gap. The lesson on locating a reliable current specimen and the page on studying unnecessary extension cover this in more detail.
How do I balance the three sciences?
Count the open entries and the shaky topics in each science once a week. If one science has almost none because you avoid it, that is a warning sign, not good news. The balance audit lesson shows how to check, and the page on neglecting one section offers a worked repair.
What about tracking progress?
Track tasks you can now do unaided. Do not turn this into a predicted grade. A list such as “can calculate a rate without prompts” is useful and honest.
When might a teacher help?
A log can show that a pattern exists without showing why. When the same group keeps returning after two or three retests, a teacher watching you solve a question can see the step you are skipping. You can read how that works on the Combined Science tuition page.