Hi

I would suggest you to focus on your class XII board exams because class XII is forever. The ideal way to prepare for both JEE Main and class XII would be to take out the common topics out of their respective syllabuses and schedule your preparation this way that you cover it all.

You can follow tips on How to crack JEE Main and plan your preparation better.

All the very best!

You should focus on both. Both are important you need to work hard to crack both the exams. Be confident.

You can set your time-table include all the topics from your board and JEE Main exam. You should focus on important topics more which carries more weightage in the exam. Make your daily and weekly targets. So, that you can complete your syllabus on time and you get proper time for revision.

Refer previous year papers to understand the exam pattern and level of questions. So, that you can plan accordingly.

Practice plays a important role in scoring good marks. You should solve complete mock test series to analyze your preparation level and make sure you do proper analysis of your exam. So, that you can improve your performance. It is very important that you learn from your mistakes.

All the best for your preparation!!