Dear Ash,

You can not predict your marks like this it totally depends on student grasping power and how much student concepts are clear.

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

You need to work hard to score good marks in your exam. 15 days are very less to crack your exam but you can try.

You can start your preparation by NCERT books. Focus on the topics which carries more weighatage in the exam. Solve previous year papers and mock test series for your practice.

All the Best!!