Hello aspirant !
Answering your question-
Below are the few mentioned courses which you can pursue after class 12 th if you have PCB as your subject. Every course has different enterance exams and different qualifying criteria.The courses are-

.MBBS  Bachelor of Medicine and Bachelor of Surgery

BHMS  Bachelor of Homeopathy Medicine and Surgery

BAMS  Bachelor of Ayurvedic Medicine and Surgery

BUMS  Bachelor of Unani Medicine and Surgery

BDS  Bachelor of Dental Surgery

B Sc AH (Animal Husbandry) Bachelor of Veterinary Sciences

B Sc  Bachelor of Science

B Sc Microbiology  Bachelor of Science in Microbiology

B Sc Biotechnology  Bachelor of Science in Biotechnology

B Sc Bio Chemistry  Bachelor of Science in Bio Chemistry

B Sc  Nursing

B PT  Bachelor in Physio Therapy

B Pharm  Bachelor in Pharmacy

B Sc Agriculture  Bachelor of Science in Agriculture

B Sc Horticulture  Bachelor of Science in Horticulture

B Sc Environmental Science  Bachelor of Science in Environmental Science

B F Sc  Bachelor in Fisheries Sciences

B Sc MLT  Bachelor in Medical Technology

B Sc Occupational Therapists

B Sc Audiology

B Sc Speech and Language Pathology

B Sc Radiography

B Sc Rehabilitation Therapy

B Sc Food Technology

B Sc Nutrition and Dietetics

B Sc Botany

B Sc Zoology

B Sc Anthropology

B Sc Home Science
Hope this helps you.