if you wanna score good marks in math just your main focus should be on few chapter from where the most number of question are asked and also the clearance of concept will be most important.

start early preparation

keep revising and looking at you work notebook

try conceptual question more for exam point of view

geometry ,calculus and statistics these three chapter hold about 75% share in the paper

you should be knowing all the very basic formulas from whole syllabus

try question with simple calculation and very tricky one

hope it helps

thanks