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For pursuing masters in organic chemistry, you should have a bachelor's  degree in chemistry or Equivalent from recognized university and should have aggregate of 50%....Some Famous Entrances for the particular course are,IPU CET,BHU PET, DUET and BITSAT and many more. Course fee varies from private college to government college. In private the fee is higher. You can check the course fee visiting the website of the college you want to go in.