i’m taking the same exams as you! i would recommend practice questions above all else because they are the singular most valuable mechanics resource. if you can, order the new maths CGP because it’s great for statistics. other than that, familiarise yourself with your calculator functions for stats as much as possible since you’ll use binomial distribution, mean, standard deviation and quartiles a lot in the exam and it can calculate that for you. for mechanics, try and learn that you need to resolve every single force you can in the direction of motion (either parallel or perpendicular).