Hey Annu, 

It completely depends on your interest, if you are interested in Nursing course and can appreciate yourself with the course then it is a very good option.from AIIMS and if you're getting a college for BAMS according to your expectations then BAMS is not a bad option too, the course has a great scope in India as well as in Abroad.

But if you are not satisfied with either go for NEET 2020.

But I will suggest you to drop only when the above courses are not matching with your interest and expectations and you are sure that you can earn enough score next time to get MBBS in a good college.

Good Luck!