Dear Jay,

JEE Main is one of the competitive level exam and you need to be dedicated to crack your exam. 

To prepare for JEE Main in one month you should make your time table to complete your course.

You should focus on important topics which carries more weightage in the exam.

Take help of NCERT books to clear your concepts and to build your fundamentals strong. 

Refer previous year papers and complete mock test series for your practice and to work on your time management. 

All the Best!!