Dear student,
You do not have much time to solve large number of questions which would have given you a lot of confidence. You should have solved questions as you were completing each chapter. But right now you have very less time left with you, I would advice you to revise one chapter at a time and then solve it's questions, by this way you will remember every topic and also would solve the questions. Look at the previous years questions and if you are not able to solve a question, try to make your concept strong in that topic. Here I have attached some tips for preparation of jee mains in the last month. For more info you may visit the following link:
https://engineering.careers360.com/articles/how-crack-jee-main-2021

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