Hello Shanu,
You can carry both preparation simultaneously. You don't need to study separately. Try to study with help of NCERT. Since, JEE Mains syllabus is completely based on your intermediate syllabus. So you can carry both courses together. All you need is proper time management and dedication. Lots of students clears it in very first attempt. So can you.
Work hard.
Analysis your syllabus and JEE Syllabus. Then prepare accordingly.
You can join weekend batches for JEE Classes.
Good Luck.

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