Hey aspirant

No you can't discontinue first year in private college. You need to pay the fee of all 5 years when you drop out in first year. Also you can't join next year with the admission of this year. If you want to join next year then you need to write Neet again and should go through all the procedures again. Instead of discontinue you could take medical leave. You can give an attempt for first year exam. If you failed either you can write say exam or you will become year back. Then you can study first year with next batch.