Dear Raji,
You have done B.Sc Biotechnology in the sense completed graduation or taken admission. Your question need a little elaboration. If you have taken admission recently then don't panic. Biotechnology is a interesting subject and you will find it good. If you had Biology in your 12th you may have come across Biotechnology. So without getting afraid start reading.  It's not much difficult as compared to Physics and Mathematics as it does not contain much numerical and data. Develop a interest towards it and start reading.