Hi, mrudula

Neet is an all India common entrance examination for the medical aspirants to get into the undergraduate courses in both government and private colleges. 

20740 is the closing rank of the ac subba reddy college as of the year 2018.

So, to get into the college the minimum marks required to get into the college would be between 550 and 560.

You can try for the second and third counselling to get into college but you'll have tough competition for it.

Good luck