Science

That particularly depends on the school that you choose for higher education by generally many schools consider 60-70% minimum to opt PCM or PCB.

Look for switching any different stream, it is purely based upon the determination and dedication of the student. It's many who switches between 12 and graduation just you need to know the basics accounts and little bit of management. In the course, you will learn a lot so don't worry.

Hi Jayananden, instead of the earnings figure out your interests to excel in your field. Your career won't grow if you don't enjoy. Know what you want, have a career plan and decide accordingly. Biology students popularly opt for one of the following
MBBS
B.Pharma
B.Sc Biology
B.Sc Agriculture
B.Sc Biotechnology
B.Sc Forensic Sciences
B.Sc Genetics
To name a few.
Research on the programs more and the career outcomes, see what interests you. You must have the aptitude and skillset too.

It needs in your interest. If you are interested in technology, you should do CS, and if you are interested in research Science, then you should do B.Sc physics.