Practice Generator
Fresh problems every time, with the numbers randomized and worked solutions attached. Companion to the guide — the tiers match its box colours.
Units
You're practising a single unit. Once you've been through the material, mixing units is a markedly better way to revise than drilling one at a time — it forces you to work out which method applies, which is most of the difficulty on the exam.
Difficulty
Core — the mechanics
Exam — what she'll be tested on
Beyond BC — college / Russian