Hi Manas, do not get disappointed. You have a year period to prepare and trust me if done correctly its a good amount of time.
Your focus should be on clarity of concepts in Physics,Chemistry and Mathematics. If you already have even a basic idea of the concepts involved,you can clear the JEE with a decent rank through intensive practice , required for strengthening your concepts. The more you practice, the better your performance is bound to be.
Apart from all basic guidelines like making a routine,  setting up targets for you, aiming at important topics keep the below point in mind:
With the good standard material you can achieve what you aim at.

Good Luck.

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