Dear student
At first congratulations and best wishes for your son's result . You have not mentioned your son's category so I assume it as general category. I am afraid to say with this marks your son's chances to get government colleges are almost negative through All India counselling for 15% seats . Your son can still try in state counselling for remaining 85% seats . Different state counselling cut offs vary from each other.
For different states it depend upon availability of colleges, student number etc various things . You have not mentioned your state . You must mention that for us to answer precisely. Your son must go for your respective state's counselling. Though chances for you are tough for you in there also for government colleges. However your son can get easily many private medical colleges.
You can further check on our link
https://medicine.careers360.com/articles/neet-cut-off-for-government-colleges
predict your son's chances here

https://medicine.careers360.com/neet-college-predictor?icn=QnA&ici=qna_answer

Best Wishes.