Hey,

Yes it is possible. There are many students who prepare for both the exams and even top both exams. The key factor being the syllabus.

The syllabus of both exams are same just the difficulty level is different. So technically if one is preparing hard enough for JEE then boards will seem very easy to them.

You just need to do one thing, practice writing. As boards are not objective so you will have to write answers. So will suggest you to practice writing so that you won't find it difficult during your board exams.

Rest you can do easily.. All the best.

Thank you.