Dear Bhanu, when you say you want to leave the course in between, do you mean to say you want to leave the course uninformed or apply for TC and collect your documents? If it is the first thing, then we are afraid you cannot get admission even if you appear for NEET and secure a seat again because your documents would be with the college. But if you resign from your seat and appear for the exam and get a seat again, you can take admission. Eitherways you can appear for NEET as long as you fulfil the eligibility criteria. You cannot be stopped from appearing for the exam.