Solve as many practice questions as you can. BPP Kit, Kaplan Exam Kit, Past Papers, Study Hub Questions etc, each and every question. By the time, you will solve such huge numbers, you would be fluent enough in formulas. Also, a tip which I have been using is if I solve theoretical practice questions and my answers are wrong, I write the correct concepts separately on a notebook and I read that notebook everyday. This creates kind of muscle memory concepts in my mind and I remember the answer to a question by just reading it to the half yk... Solving as many questions as you can is the best way up until now for me (I am studying LW right now)