B.Sc Microbiology

Search in google or in the college website. You will get to know. No one can tell you about the courses as it is an internal matter. So, search it and get the answer.

Please refer to the link provided below for details regarding TS-OUCET entrance test.
Link: https://www.shiksha.com/humanities-social-sciences/exams/oucet

Yes, you can pursue M.Sc in Psychology after completing B.Sc in microbiology.

If you want to study further then there are good options for Masters in microbiology. You can go for PhD. You can also get a good job in different research institutes. You should go for PhD and become a scientist.

Fee of B.Sc Microbiology is Rs. 33,500, and you can get direct admission in B.Sc Microbiology, if you secure minimum 40% marks in 10+2 with PCB.

Please refer to the link provided below for a list of colleges offering B.Sc. in Microbiology in Kerala. Please download the brochure to get details on eligibility for correspondence courses in B.Sc (Microbiology):
https://www.shiksha.com/science/colleges/b-sc-colleges-kerala

That depends on what you want to do after graduation. You could pursue a career in medicine or opt for higher studies. I would suggest you get some work experience before you pursue higher studies as most colleges require work experience as a pre-requisite for M.Sc and MS courses.