Greetings!

Congratulations for your sons great score ,

BRAVO!

Now the marks and cut off is never constant  so it is hard to say the exact value till the results are out

It depends on external factors like exam difficulty level,amount of students appearing and on internal factors like,your category ,age and score so we can only make a vague idea

but looking at your score there is a slim chance of getting into a government college,even if you get one it wont be a very good college

weigh your pros and cons and make  a wise choice

Check your predicted rank at

Https://medicine.careers360.com/neet-rank-predictor

And your predicted college at

Https://medicine.careers360.com/neet-college-predictor?icn=NEET_clgpd&ici=NEET_article_view_sticky

Hope this helps

Good luck 

Future doctor

Good luck