Marking matters more than the test
Most families treat the practice test as the work and the marking as admin. It is the other way around. Sitting a test tells you the score. Going through it properly is what changes the next score.
The good news is you do not need to be good at maths to do this well. You need the worked solutions and about twenty minutes.
Step 1: let them mark it themselves first
Hand your child the answer key and have them mark their own paper before you look at it. Two reasons. They engage with each mistake rather than just receiving a number from you, and it keeps the whole thing from feeling like a judgement.
Ask them to put a mark next to every question they got wrong, and a question mark next to any they guessed and happened to get right. Lucky guesses are gaps too.
Step 2: sort every error into one of three buckets
This is the part that does the work. For each wrong answer, ask which of these it was:
Silly mistake. They knew the method and slipped, dropped a negative, misread the question, copied a number wrong. Note it, move on. This is not a knowledge gap, and drilling the topic again will not fix it. If silly mistakes are frequent, that is a checking-habits problem, not a maths problem.
Method gap. They did not know how to start, or started down the wrong path. This is the real target. These are the questions worth re-teaching and re-testing in a few days.
Ran out of time. They knew it but did not get there. That needs more practice at speed, not more explanation.
Sorting errors this way stops the most common mistake in home study: re-teaching an entire topic when your child only had two silly slips and one genuine gap.
Step 3: get them to explain one question back to you
Pick a question they got wrong and had to look up. Ask them to talk you through it as if you had never seen it. If they can explain it cleanly, it has landed. If they get stuck halfway, it has not, and that is worth knowing now rather than on test day.
This works even if you cannot follow the maths. You are listening for confidence and coherence, not checking their algebra.
Step 4: make a short list, and re-test it
Write down only the method gaps, usually two to four topics. That list is what they practise this week, and what the next practice test should focus on. Everything they got right does not need revisiting.
What to avoid
- Marking it for them while they watch. They disengage within a minute.
- Reacting to the score. A low score on a diagnostic test two weeks out is useful information, not bad news. If a low mark leads to a difficult conversation, they will start hiding results from you.
- Re-teaching everything. Target the gaps, leave the rest.
Build the next one
Generate a fresh test on the topics that came up short, with full worked solutions for the marking step: