Hello Ankit, 

Scoring 600 out of 720 is really a very good score. At this score, you will definitely get a very good govt. college in any of the states you want.

Patna Medical College, Patna

Government Medical College, Kottayam

Government Medical College, Thiruvananthapuram

MGM Medical College, Indore

These colleges will be your easy targets. 

I am sending you the link where you can find the list of colleges and their cut off. 

https://www.google.com/amp/s/medicine.careers360.com/articles/neet-cut-off-for-government-colleges/amp

All the best.