Marks in mains is not the correct parameter to decide that you will get a seat in any colleges under mains(government colleges). we can decide it by your rank.

if your rank is below 28k(most accurately) in jee mains, then you can get seat in government colleges under mains.(max upto second round of counseling)

But try to get below 20k at least because,you have good range choices in your hand and opt for the course which you are interested.

Marks VS rank changes every year, but Rank VS college doesn’t change much.

hope you got my point.

All the best(: