I am going to p 10th and i am confused about what subjects to opt for in 11th. i want to do biotechnology?

or pharmacy but i don't know what subjects would it require. physics and chemistry are compulsory and i like biology,so i'll be taking all of these but they say perhaps maths is also required.i have been scoring good in maths and i like mathematics too but they say it would be difficult to cope up with all these four major subjects in 11th and then people find it rather difficult to put emphasis on pcb, but as i have to do biotechnology, it would require maths too..! actually,i am confused if maths is compulsory to get ahead in this field. and then i have other options like computers and physical education, so please help me out by tell me which subjects should i opt for as the 3rd and 4th subject - biology,maths,physical education- any two out of these three and how would they help me in pursuing my career?