Dear Yogesh, it depends on what you want to study after your 12th. If Biology has been your main subject, the first option is MBBS. For admission in Medical, Dental and Ayush colleges, you need to appear for NEET. There are Agricultural, Biotechnological, Veterinary, Ayush streams. Apart from that there are Physiotherapy, Occupational Therapy, Psychology, Sociology, Sports Psychology, Horticulture, Forestry Sciences, B.Pharmacy, Nursing, Forensic Sciences. There are Diploma Courses like Radiology and Imaging Technology, Lab Technician, courses. CBSE has released a list of courses that are availablebfor students after their 12th. It is a list of 113 courses. You can check them at: http://cbse.nic.in/newsite/index.html