Hello aspirant.

To do MBBS , you need to appear for NEET examination .

Below are the eligiblity criteria for NEET .

10+2 or equivalent with Physics, Chemistry, Biology/Biotechnology and English as core subject in both Classes 11 and 12 from a recognized board.

Need to score minimum of UR - 50%, OBC/SC/ST - 40%, PWD - 45% (minimum aggregate marks only for PCB subjects).

To get more information refer 

https://www.google.com/amp/s/medicine.careers360.com/articles/neet-eligibility-criteria/amp

To become eligible for JEE mains examination , candidate need to score minimum of 75% in the qualifying examination. 

75% marks in class XII or equivalent exam or be in the top 20 percentile in their class XII exam conducted by the respective board.