No. That MBBS and BPT are 2 different courses, you do not need to take any NOC unless you are in the middle of a service bond and you getting a seat means you have to forgo the remaining service period of the bond. NEET has no upper age limit and also has no cap on no.of attempts as of now. So as long as you qualify for NEET, you can appear for NEET. To be eligible for NEET, you should be 17 years atleast as on December 31st of the year of admission and also to be eligible for NEET, you should have completed your 12th, passed in all subjects and 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 if you belong to OBC Category, the Category you belong to should be also listed in the Central OBC list. Or else you will be considered as General Category and so you have to secure a minimum aggregate of 50% in Physics, Chemistry and Biology. This 50% is inclusive of the Theory and Practical marks scored in Physics, Chemistry and Biology collectively. You needn't score 50% in Physics, 50% in Chemistry and 50% in Biology separately. You need an aggregate of 50% or 40% depending on your Category as an aggregate in Physics, Chemistry and Biology. And along with Physics, Chemistry and Biology, you should also have studied English as one of the core subjects in your 12th.