MCAT is for Candidates who want to pursue Medicine in the United States, Canada, Carribean islands and Australia. If you are from India, you need to complete your 12th with Physucs, Chemistry, Biology and English as your core subjects and then appear for NEET. Because qualifying in NEET is mandatory even for students who want to study MBBS abroad. Once you qualify in NEET, you can appear for MCAT and then start the process for applying to study Medicine in any of these Countries.