Starting with educational qualification, Candidate must have passed 10+2 Science stream with Physics, Chemistry and Biology subjects, from a recognized board.
Minimum aggregate marks required in PCB subjects- 50%.
Minimum marks scored in Biology subject- 50%.
*Note: Minimum marks criteria may vary (usually around 50% marks).

Candidate must also have taken part in medical entrance examination organized by State or Central Government. Some of the well known entrance tests are- NEET UG, AIIMS Entrance,  JIPMER.

You can check the NEET eligibility here.

After completing MBBS, graduates may go for the below mentioned PG courses-

• MS (Master of Surgery)- 3 years long
• MD (Doctor of Medicine)- 3 years long
• PG Diploma- 2 years long
• DNB (Diploma of National Board)

This is how you can get above the cut throat competition in today's time.

Hope this helps.
Good luck!