Dear student,
It would be nearly impossible to begin your preparation at this time from scratch. But if you have studied all year round then at this point of time you must begin your revision and solve previous years questions of jee mains as much as you can. Also you can enroll in some test series to increase your speed and accuracy. Also you can focus on the most important topics at this point of time. You can atleast solve the previous years questions of the important topics.
The link for important topics of jee mains 2021 is as follows:
https://engineering.careers360.com/articles/most-important-chapters-of-jee-main

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