Try to solve last 5 year papers. It will give you a fair idea of what type of questions are asked. Don’t study everything. GK and English part are most scoring, so try to maximize your score by regular practicing, reading and attempting mock tests. Whenever you feel lazy or sleepy choose to study quant or reasoning with the time limit as puzzles will keep your brain alert.
For the English part, ‘Objective General English by SP Bakshi’ can be really helpful if you really want to speed up your comprehension skills.