I guess you are asking about best course for biology student after 12th

1. MBBS

2. Bachelor of ayurveda medicine and surgery

3 bachelor of homeopathic medicine and surgery

4. Bachelor of unani medicine and surgery

5. BDS

6. bachelor of veterinary science and animal husbandry (B.VSc AH)

7. bachelor of naturopathy and yogic science (BNYS)

8. bachelor of physiotherapy

9. B.Sc nursing

10. bachelor of pharmacy

You can also visit the link below for more info regarding what to do after class 12th PCB:

https://school.careers360.com/articles/courses-after-12th-pcb

I hope my answer helps. All the very best for your future endeavors!