Hello
You have not mentioned the college you are interested in.
However for B.Sc course in government colleges the fees is usually 4000 to 20,000 Rs per year. And for private colleges it may go upto 1 lakh per year.
Admission to B.Sc courses in most colleges are based on marks secured in class XII, however some universities also conduct their own entrance examination for admissions.
It is a 3 year undergraduate course, you can either opt for B.Sc Program in which you will be taught all 3 subjects(Physics, Chemistry and Mathematics) or you can opt for honours course in any one of the subjects. For eg B.Sc Physics, it will specialise you in that specific subjects only.

Good luck