Hello student if you're willing to pursue MBBS and become a doctor after completing your high school (class 12) you need to appear in NEET entrance examination.

Eligibility - Candidates must passed or appearing class 12 in Physics chemistry and biology with minimum 50 percent marks from a recognized board.

You can also use careers360 knockout package for preparing and qualifying Neet entrance examination.

Refer to the link mentioned below and - https://www.google.com/url?sa=t&source=web&rct=j&url=https://learn.careers360.com/knockout-neet-may/&ved=2ahUKEwjPkKiB55DsAhXBYysKHW9vCq4QFjAAegQICxAC&usg=AOvVaw3IQ2iNLvR11fH2dBguo0xU

Prefer NCERT to build your basic concept and make sure you solve each and every example and exercise question of NCERT before jumping to any reference book.

Feel free to comment if you've any doubt

Good luck