Hello,

Yes, you can definitely score well in boards examination and JEE main exam also. You need to manage your preparation and make a proper study plan. Syllabus which you will study for the board exams will also help in JEE main exam. You should refer to NCERT textbooks to have better understanding of the topics. Managing your time effectively is necessary.
Refer to the link below for detailed infromation-

https://engineering.careers360.com/articles/how-prepare-for-jee-main-and-class-12th-board-exams

Good Luck!

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