Hey,
If you want to prepare for JEE Mains parallel to you Btech, you can do it. For that you'll have to do a lot of efforts, you'll have to study yourself in your free time, and thats not much tough as while Btech we have a lot of free time, so you can go through previous year papers and can even take help from Arihant publications self study books for each subject. This way you can start your preparation for JEE.
Hope this solves your query.
Good Luck!

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