Hello Surya,

I am sorry to say but it will be hard for you to get a seat in NITs,IIITs or GFTIs on the basis of your JEE Main percentile. To get these colleges, one has to clear the required cutoff as per his/her category. Now according to 2019 JEE Main cutoff , the cutoff for general category candidates are 89.75 percentile. Since, you have got 89.231 percentile you were near about the cutoff but not qualified. Still you might be able to get a seat but for that you have to attend the JoSAA counselling through which colleges like NITs,IIITs and GFTIs are allotted to candidates on the basis of their merit. You may not get in the first few rounds of counselling but could get in the last rounds of JoSAA counselling. 

You can go through this link and check the details regarding JoSAA counselling : https://engineering.careers360.com/articles/josaa-counselling

Good Luck !!!