Hi Astik,
Revise the chapters of 11th and 12th standard. You can also prepare from the books whose link is given below:
https://www.amazon.in/JEE-Engineering-Solved-Paper-2018/dp/9312140590?tag=googinhydr18418-21&tag=googinkenshoo-21&ascsubtag=38023e9f-c6d2-49c8-b571-2124179b7a92
Thank you and best of luck.
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