hi,

see wbjee exam is based on 10+2 course syllabus, so if you have good grip your 12th course subject, you have really good chances to get a good score,

first of all do practice a lot of questions, mcq type questions,

mark the weak areas, and make short not,

learn to make time management for each subjects, do mostly focus on mathematics and physics, as for engineering ranking maths and physics gets priority.

try to not give any wrong answer as there is negative marks deduction for each wrong input.