Hii!
Do not worry, it will yield nothing and in addition, you will not be able to concentrate and prepare for the exam. You can try out meditation to keep yourself calm. Also, take a light and balanced diet and take proper sleep. This will help reduce stress.
You need to study with full dedication to gain self confidence. Make a timetable and follow it. Give more time to the subjects you feel are tough for you. Practice previous year question papers too, it is very important for practice.
You need to refer to the right books too, to prepare well.
The links given below will help you with more information -

https://www.google.com/amp/s/engineering.careers360.com/articles/best-books-recommended-jee-main-toppers/amp

https://www.google.com/amp/s/engineering.careers360.com/articles/jee-main-preparation-tips/amp

Hope this helps.
Good luck!

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