OK for me, understand all the theory beforehand required by syllabus and jot down really important stuff, like solubility rules for chem on a piece of paper. Revise these stuff regularly. Know how to do calculation and use principles (ie. Le Chatalier) by doing some questions. Once you have got good at calculations, then all you need is the cram the night before and digest as much minor details of the theory into your head (like polymer names and their uses- always forget after a few days)