Hello Aspirant,

According to your score 87 percentile in JEE mains, your general category rank will be somewhere between 136000 and your ST rank will be around 1,900.

It is little difficult to get ECE, CSE, EEE branch in top NITs, IIITs because getting a seat will depend on varies factors such as number of students applied for the same branch, performance of the students, category of the students, home state etc. But you have chances to get the following NITs-

1. NIT Meghalaya
2. NIT Manipur
3. NIT Sikkim
4. NIT Mizoram

Go through this link to get detailed information about total number of seats :

https://engineering.careers360.com/articles/nit-seat-matrix

Use the below link to get list of colleges that you can get based on your rank :

https://engineering.careers360.com/jee-main-college-predictor?utm_source=qna&utm_medium=jee_cp

check out the previous year's cutoff for NITs:

https://engineering.careers360.com/articles/jee-main-cutoff

You can also check out marks vs rank vs percentile from the below link:

https://engineering.careers360.com/articles/jee-main-marks-vs-percentile

Hope this information helps you.