CBSE 12th

If you have interest in biology, then choose (Bipc) only i.e Biology in class 11th.
1) After that, write NEET. If you get a good college, go for MBBS and after getting MBBS degree, prepare for IAS and write UPSC. There are some IAS who came through this route.
Or,
2) Study Biology only in class 11th & class 12th and choose B.Sc, or any other subject related to Biology in your graduation level. After 3 years, prepare for IAS and write UPSC.
Or,
3) Study Biology only in class 11th & class 12th and choose BA or BA ORB. Complete your graduation level, and start preparation for IAS and write UPSC. Go with your interest. Don't listen to me nor your parents nor some Dharma uncle. It is your future. You must decide what to do? How to go about? Just follow your interest and your passion. Don't study any subject just because someone forced you. If you want more guidance, visit any career counsellor, but do not take a wrong step.

There are many ways to take admission in Punjab University, Chandigarh. It all depends upon the stream in which you want to take admission. These are various courses at undergraduate and postgraduate level. Examples if you want to take admission in MBA in Punjab University, Chandigarh then you have to appear for CAT then according to your percentile, you'll get a call from university business school, Punjab University Chandigarh. If you want to be a part of law faculty then there are two law faculty one for five years law and second for three year professional law. For five year you have to appear for CLAT and for three years you have to appear for OCET internal exam of Punjab University Chandigarh. The score of OCET is also considered for other courses like M.A English and M.A journalism and other undergraduate courses like B.Sc honors. For more information please log on official website of Panjab University.