Hello Alok Singh

For a govt. medical college seat, you have to secure at least 530 (with all India quota) in NEET. 530 is a safe score but it depends on no. of rounds of counselling. Cut off may come down, but still try to secure above 520.  Cutoffs vary every year due to category you belong to, marks scored, no of students appearing for the exam and counselling, no of seats in the college, difficulty level of the paper etc. A lot of factors determine the score and rank but on the safer side you need 600+ marks which won't case any problem to you.

Hope it helps you.