There is no Bridge course per se, Sam. If you have completed your 12th with Physics, Chemistry and Mathematics, you can pursue Biology as an additional subect and appear for NEET. You should secure a minimum aggregate of 50% in Physics, Chemistry and Biology. It is 50% for General Category, 45% for PWD and 40 for OBC,SC,ST. Now NEET is the entrance examination for admission to MBBS course across India and abroad as well. So if you fulfill this criteria, you can appear for NEET and study MBBS to become a doctor.