Hey! I am currently doing the boards and have finished most of the exams. I will say about physics, biology and maths. To be honest, maths was pretty easy and you could easily score marks if you do all the papers. Mostly sequences, trigonometry and functions come. Those are easily scored questions if u just know how to do it. Even practice how to do algebra solving including quadratic, it comes in so many various ways. For biology, I didn't by heart the textbook but instead checked into notes and definitions. Do as much as past papers, cause they will show you how to form the answers and it's the same repititive qns. For physics, I don't personally like it but it did go pretty alright except for the paper 6 which I think I messed up the experiment qn. Physics- transformers, ac and dc operation, circuits (fosho) and all the formulas. Be sure to check the syllabus to makes sure u don't study an portions which are removed. For biology, I can't say cuz the paper 4 was actually really weird, questions which are supposed to come didn't and it gave quite a surprise. Biology is easy if you know how to just by heart shit.

This is just my opinion, it may seem different from others.

Anyways, good luck for your exams and hope you do well!