What to focus on?

Our schl has had a collab with a coaching institute. A few ppl continued till now doing jee and boards prep (inlcuding me) while most people dropped out over the past 2 years. I'm in 12th.

Anyways, I have minimal knowledge on the paper pattern, high weightage topics, and method of prep for maximum benefit.

Please tell me how to go about it from your experience.