If you're from cbse board then it would be pretty easy. A good hold of concepts from NCERT of Physics Maths and Chemistry should fetch the a decent score in JEE Mains. If you are looking for a higher rank then I would advise you to practice higher level questions.
For physics I would suggest HC VERMA and RD SHARMA for math.

Hey!There

You want to prepare for JEE MAINS in drop year .If you are financially good then you should enrolled yourself in good tution academy because it is really hard to do preparation for big entrance examination like JEE MAINS without any tution academy.If you think you can be devoted and dedicated for JEE throughout preparation then you can do preparation from home,you just need good package and study material.You can go with DLPD package of ALLEN or RESONANCE..

I hope this helps..

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