How to use these answers
The questions below are the ones undergraduates, postgraduates and adult learners returning to study actually ask first, in roughly the order they ask them.
They are written to be read quickly. If an answer raises a further question, that is the right reaction, and the guides go deeper than this page does.
The question underneath most of these
Nearly every question here is a version of one worry: will this be slower than just being told?
In the first session, yes, noticeably. Across a term, no — because the thing that takes the time is re-learning what was never understood in the first place.
What this cannot do
It cannot make an unfamiliar idea feel familiar without effort from the person learning it, and it does not claim a particular outcome or score.
It also will not simply produce the answer on request, since that re-reading notes is studying is the failure it exists to catch.
If your question is not here
Ask it directly during a demo — bringing the specific case is more useful than the general question, and the week before an exam, with four chapters still unread is exactly the kind of detail worth mentioning.
Otherwise, start with the advanced guide on question ladders, then a session on the paper you are preparing for — between them they answer most of what this page does not.