Practice for the college entrance exam, marked as soon as you finish, with an explanation for every question you got wrong.
Sit a diagnostic that covers every subject at once to find out where to begin. Practise a whole subject or a single topic, and get the set marked straight away with an explanation for everything you got wrong. Read your own scores by subject and by topic, and an ordering of what to practise next.
Your score for each set is kept, so the people supporting you can see how you are doing. Your answers are not kept at all.