Hello,

Courses that you can do after 12 biology that is PCB are :

• Botany-- With a degree in Botany, you can work in landscape industries, natural resource centres, environmental consultancies, or as a researcher, teacher/professor, taxonomist, horticulturist, nursery manager, and environmental consultant.
• Zoology---- With a degree in Zoology, you can find work as a researcher, animal breeder, wildlife rehabilitator, wildlife biologist, zoo curator, conservationist, teacher/professor in schools and colleges, etc
• Microbiology---- Typical employment opportunities include clinical researcher, research scientist, lab technician, quality control, working in pharmaceuticals, health sector, food industries, breweries, distilleries, agriculture, etc.
• Biochemistry---Since it is a growing field, you can find numerous exciting opportunities such as biomedical scientist, forensic scientist, clinical laboratory technologist, toxicologist, etc.
• Environmental Science--- Environmental scientists are hired for research and other roles by various industries such as mines, water-treatment plants, fertiliser plants, etc. and different government departments and agencies such as forestry, pollution control board, agriculture, etc.

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

You can refer to this link for more information.

Hope this helps!!