For qualifying for JEE main, you must either have 75 percentage of marks or you must be in the top 20 percentile in the 12th board examination. And as you are in the top 20 percentile in your board examination. So you are eligible for admission into the NITs .

Good luck

Hello aspirant,

You mentioned that now you are in the top 20 percentile. But to get a seat in any of the NITs i.e. National Institute of Technology you need to have a good rank in Jee Mains which you haven't mentioned. If your this criteria is also fulfilled i.e. you have a good rank in JEE MAINS then you can get a seat. And as mentioned in your tag Narula Institute of Technology is different form NITs. It donot comes under NITs. To get a seat in Narula Institute you need to give WBJEE or JEE MAINS. according to the previous year cutoffs having a rank within 100000 can secure you a seat. 

Hope it helps! Thank you.

Greetings to you,

As per JEE guidelines, the candidate must have secured at least 75% in class 12th boards or must be in the top 20 precentile for the same in the state. Since you satisfy the second option in the criteria, you are very much eligible to appear for JEE Mains to stand a chance get into NITs, IIITs or GFTIs. Good luck.