What's the best way to revise for S1? I've given up on past papers because they didn't seem to prepare me much for both the C1 and C2 exams (mainly C1 though). I need a way of learning all the topics without wasting too much time doing papers but questions that will help me be prepared for the exam. Any ideas?
Also, as there are so many ways to work out the Lower and Upper Quartiles, what do you think is the most effective way?