NEET is now compulsary for CBSE studemts who wish to join Engineering colleges.
NEET stands for NATIONAL ELIGIBILITY CUM ENTRANCE TEST
Visit http://cbseneet.nic.in/cbseneet/online/instruction.aspx for details
The following links will help you prepare for NEET well.
Buy NEET 2013: 10 Mock Tests Physics, Chemistry, Zoology and Botany from Flipkart.com