Hi aspirant!
PCMB is the highest streams of subjects and hence you can pursue any  course associated with it. It can include bachelors in chemistry, zoology, physics, botany, mathematics. Also you can study microbiology, biotechnology which are the research fields. The fee in government colleges are quite affordable.
The annual fee in any government college under these courses or any other courses associated is approximately 25-35000. While if you choose any private college it can range from 50k to 1lakh as per the college ranking.