Before it goes to him
Check the curriculum
144 cards, 576 questions. One card at a time, and it remembers where you got to, so you can do a subject an evening rather than the lot in one sitting. Anything you flag comes out at the end as a list you can hand straight back to me.
Doing it by subject is easier than straight through. Maths and Science are where a wrong answer costs him most in front of a class.
Where your progress lives
In this browser on this machine, and nowhere else. Start on the laptop and stay on the laptop, because a phone will show you a fresh, empty run. Nothing is sent anywhere. That is the trade.
If the window has focus you can also use the keyboard: Y for fine, N to flag, arrows to move. The buttons do the same job if it does not take.