Hi Vivek,

80% is a pretty decent score, well done! There are various paths which you can take after you complete school. One of the most obvious paths for a PCB student is to give the NEET exam and get admission in a medical college. If that doesn't interest you, you can get a degree in Zoology, Botany, Chemistry, Physics, or some newer areas such as Biochemistry, Biotechnology, Microbiology, Biomedics etc. Some of the newer and advanced courses mebtioened above may not be available in all colleges, kindly check for the same.

If you have an interest in language, you can pursue a career in that. You can do BA in English. It can open up various opportunities for you. You can also prepare for Civil Service exams alongside your undergraduate degree. 

It really depends on what you are interested in. You will have to figure out which path to take.

Hope this helped!