Hey !
For admissions to NITs/ IIITs/ GFTI's, one  need to have secured a minimum 75% marks in class XII or equivalent exam or be in the top 20 percentile in their class XII exam conducted by the respective board. For SC/ ST candidates, the eligibility criteria are to secure 65% marks in class XII or equivalent exam. As you have mentioned of scoring less than 75, you cannot get into the above. And the Institutes which you can try are state level Engineering Institutes and also you can try in other deemed universities (if your JEE mains score is too good ).
Hope this helps
All the best !

Hi dear,
    Every college has its own criteria for admission in engineering.There are some colleges which provide admission on jee mains basis and the eligibility of 12th percentage is less than 75%.
GNDU , Amritsar provides admission on jee mains basis and the minimum +2 percentage required is 50%.
You can apply in DTU and NSIT  which require 60% aggregate.
Thapar university,patiala
Lovely professional university,jalandhar

These are few colleges where you can get admission with less than 75%.

Best of Luck!!

For getting admission in any iiit, nits, gftis you need a minimum of 75% in boards. Since you have cleared it you can get in any nits according to your percentile and rank. And you can take admission in other government colleges also

So it's difficult to get nits or iiits as you got less than 75 percent 

Try for Thapar University Jadavpur University and also you can get into  Chandigarh University 

The admission depends on your JEE main rank

Anyway you can try for state colleges 

Many top colleges accept JEE main score 

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