Hey Asmita.

There are many good state colleges which accepts the marks under 75% in the boards examination and give admission on the basis of the their entrance exam.

U haven't mentioned ur state so I cannot tell u about the colleges but u will surely get a good college but for that too u have to clear the entrance exam of the concerned college.

Hope u got my point. Ask if u are having any query.

Good luck

Hello!Ashmita
To be an elligible for admission through entrance examination of government engineering college one need at least 75% in cbse boards examination.If you are from state boards you need to be in top 20 percentile to be an elligible.This is the elligibility criteria for entrance examination like JEE MAINS,JEE ADVANCE,BITSAT etc.For other government engg college elligibility criteria may be different.
You can ask if you have any other queries.
GOOD LUCK!

hello asmita sen ,

IITs and NITs accept student with 75% or above.

You can apply in DTU and NSIT they consider JEE Main marks to provide admission but counseling is held separately through JAC Delhi for eligibility you must have secured at least 60% aggregate marks or more in Physics, Chemistry and Mathematics there is relaxation for backward category as well.
There are many private colleges as well who consider JEE Main marks to provide admission. Below is the list of colleges you can check