Dear student,
Isc board has several extra topics that are not there in jee syllabus. So make sure to cover the jee syllabus completely first of all. And you have studied to score at least 98% then I think you can easily crack jee mains. But jee has a different pattern. Boards examination has too much of theory with provings so you need to focus on solving more and more questions because there are very less questions from theoretical part. I would advice you to solve the previous years question papers and sample papers. Also join some test series or mock tests to analyze your performance. Studying for boards is actually not that enough, if you want to score good rank in jee mains then you have to put sone efforts for it even.
This link will be helpful for you:
https://engineering.careers360.com/articles/jee-main-question-papers

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