Hello Aspirant

First, you will have to decide, if you are giving your all  for JEE, if yes then you should not worry too much about boards.

For JEE:

Always keep your basics clear. Spend most of your time solving JEE problems and mastering concepts.

Solve past 5–6 years Chapter wise (important) problems, but do not solve each one of them, because they are repetitive, so just observe the trend +NCERT

Also taking a risk in chapters like semiconductors by trying to studying them yourself could be a waste of time.

For Practical Exams: Questions are quite easy, You will just have to remember some standard Stuff.

Pay full attention while studying NCERT

Hope this helps

Hello Aspirant! In board exams, revision is the key to scoring marks. Its also important for JEE Main that you remember all the formulae so that you don’t miss on the easy questions. If you have a time constraint, prioritize the chapters with maximum weightage in JEE Main, which you have already covered and make sure that you revise them. Use the time for preparing for board exams to optimize your JEE Main preparation.  Be very practical and create a plan accordingly that satisfies boards as well as JEE Main preparations. Do not compare your board exam preparation with your JEE Main preparation. In fact, you shouldn’t compare any aspect of these exams. Use the time during board exam preparation to optimize your JEE Main preparation. Create short notes for JEE Main by revising all the theory which will also help in your board exams.

Don't be stressed and prepare well. All the Best!