Hello,

With the marks of 520 in neet 2021 , the chances of getting a seat in government medical college is quite very low enough. As according to the previous year reports, in neet  2020, 606 marks for obc category was the cut off marks  to get a seat in Govt. Medical College   under UP  state quota. Rather you may try for private medical colleges which might be quite possible to get through your marks. The private medical colleges may include

IIMSR Lucknow - Integral Institute of Medical Sciences and Research Fees 4,500,000

Netaji Subhash Chandra Bose Subharti Medical College, Meerut

School of Medical Sciences and Research, Greater Noida Fees 5,475,000

For more information refer to

https://medicine.careers360.com/colleges/list-of-private-medical-colleges-in-uttar-pradesh