Probability
Fair and unfair games, and what 'likely' actually means.
27 questions · one topic · every mistake asked more than once
What this topic gives you
Included in the subscription
Your child sits it on screen and it marks itself — then the dashboard turns those marks into a plan:
- Every wrong answer sorted to show the exact mistake behind it, in plain words
- Whether your child has not learnt it, cannot spot it inside a worded question, or was simply rushing
- New practice questions, made just for the mistakes your child keeps getting wrong
- Quick re-tests later to check a mistake is really fixed, with a count of the marks won back
- It spots mistakes that keep coming up across different topics
- A one-page summary you can print and hand to a tutor or teacher
Not sure yet? Try your first topic paper free
Why the subscription
The paper finds the mistakes. The dashboard fixes them.
The paper shows you where the marks went. The dashboard turns that into a plan — and keeps score as the mistakes come down.
The diagnosis, done for you
Every wrong answer is sorted by the kind of mistake — not just right or wrong — and explained in plain English. No maths degree required.
Practice sheets from your child’s own mistakes
The dashboard builds short, targeted sheets that re-drill the exact mistakes still costing marks — and tracks how many marks come back as your child gets them right.
Every mistake asked more than once
One right answer proves nothing and one wrong answer proves nothing. Each mistake is asked more than once, so wrong every time is a gap, and two right with one rushed is only carelessness. Nothing else tells those two apart.
The marks lost to rushing
Only the last part is timed, and that is on purpose. If your child gets a mistake right earlier in the paper and wrong there, those marks went to speed rather than to not knowing. They are the quickest marks on the paper to win back, because your child can already do the maths.
The mistake that travels
Across every pack you own, the dashboard names the mistakes that follow your child from topic to topic. No past paper can show you this, however many they sit.
Progress you can watch
Re-sit any pack and the scores line up side by side, so a child — and a parent — can see the mistakes falling away.
What this pack catches
9 mistakes, each asked more than once and in a different form every time. Which of them goes wrong is what separates carelessness from a real gap — and one wrong answer can never tell you which it was. That difference is the whole point.
Counting outcomes. Adds the choices instead of multiplying — or misses outcomes like 5 + 5 when listing.
Which outcomes count. Includes the boundary that shouldn't count (bigger than 4 keeps the 4) or misses an outcome from the event.
Expected counts. Multiplies by the wrong thing — or answers with the probability when a COUNT was asked.
Three examples of many. Your dashboard names every one your child actually makes.
The three parts
Every mistake is asked more than once, in a different form each time. That is the only way to tell a careless slip apart from something your child has never understood. Ask once and you cannot know which you are looking at.
Part 1 — Asked plainly
The mistake on its own, with nothing else going on. Can your child do it at all?
Part 2 — Buried in a longer question
The same mistake hidden inside a longer problem. Plenty of children can do the drill and still not spot it here, and that is where most marks quietly go.
Part 3 — Quick, against the clock
The same mistake once more, short, at the end, with a clock running. This is where rushing shows up.
Right in Part 1 and wrong in Part 3 means your child knows it and rushed. Right in Part 1 and wrong in Part 2 means they know the method but cannot spot when to use it. Wrong in all three means they have not learnt it yet. Three different problems, and each one needs something different from you.
What’s in the pack
- The paper — the 27 questions your child answers on screen.
- Every answer marked the moment they finish, with the silly mistake each question was built to catch.
- A sentence you can read out to your child for every wrong answer, so you do not have to work out how to explain it.
- Your dashboard — the mistakes named, told apart into careless and not-yet-learned, and tracked across every pack you own.
Questions parents ask
What exactly is included?
The diagnostic paper, the answer booklet, a parent guide and a one-page mistake summary — all on screen. Your child sits the paper on the device you hand them, it marks itself the moment they finish, and the dashboard names every mistake.
How does it help my child?
It doesn’t just give a score. It names the exact mistakes costing the marks, and then builds practice sheets on those mistakes and nothing else. So your child works on what is actually wrong, instead of sitting another whole paper and hoping.
When should my child take it?
Whenever suits you. It’s a snapshot of how much of that topic your child can do at that moment. Sit it right after learning a topic and you’ll see what landed; sit it weeks later and you’ll see what’s stuck and what’s quietly slipped. Either way, you work on exactly what’s still needed from that point.
What will I get back?
The mistakes with the most-repeated first, and the exact question numbers. Whether each one is something your child has not learnt, cannot spot inside a worded question, or simply rushed. Whether they are working too slowly. The mistakes that follow them across every pack you own. And a one-page summary you can print and hand to a tutor or teacher.
Can they keep practising after the diagnostic?
Yes. Targeted worksheets are made just for your child — drilling only the mistakes they made, so no time is wasted on questions they can already do. And any time while you own the pack, you can build a worksheet across the whole topic, to keep their knowledge fresh.
How many times can they take it?
The diagnostic itself is one honest sitting. After that, every practice sheet is built fresh: different numbers, different settings, same mistake. So your child can practise as often as you like and can never get a question right just because they remember the answer from last time.
Can I see how my child compares with other children?
Coming soon.
Where do I start?
If you already know your child’s weak topic, start there. If not, work through the packs systematically so every topic gets covered — well before exam day, with plenty of time to use the worksheets and improve.
Is it a subscription?
Only the monthly one, and you can cancel it any time from your dashboard. The 6-month and 12-month plans are single payments that do not renew. Either way, your child’s results stay yours to read.
Can I get a refund?
Once your child has started the paper we cannot undo it, so please choose your topic carefully. You agree to this before you pay. If anything is faulty we always fix it or replace it.