Hello Akbarali!

Getting a college especially for MBBS and that too with just 506 marks  entirely depends upon your Home State. Like if you were from Karnataka, Maharashtra, Tamil Nadu, etc then it would have been a better score. But if you are from states like Haryana, Delhi, Rajasthan then this isn't enough. 

Check out the college predictor for a clearer idea of which colleges you might get. 

https://medicine.careers360.com/neet-college-predictor

Hope that helps!