Hi there,
with 4300 Sc rank there are a lot of options available to you:-
1) CSE:- NIT Sikkim, Srinagar, Mizoram
2) IT:- NIT Srinagar, IIEST Shibpur
3) ECE:- NIT Hamirpur, Agartala, Raipur, BIT Mesra, IIEST Shibpur
4) Mechanical:-NIT Hamirpur, Agartala, Raipur, Patna, Andhra Pradesh, BIT Mesra, IIEST Shibpur

Hope it would help.
Check out our college predictor to have exact knowledge about your admission chances:-
https://engineering.careers360.com/jee-main-college-predictor

Dear Aspirant, according to previous years' cutoffs, at 4300 category rank you might get the following NITS:-

1.NIT Andhra Pradesh

2.NIT Calicut

3.NIT Silchar

4.NIT Patna

5.NIT Meghalaya

6.NIT Jalandhar

7.NIT Rourkela

8.NIT Durgapur

9.NIT Bhopal

10.NIT Hamirpur

11.NIT Nagpur

12.NIT Mizoram

13.NIT Manipur

14.NIT Agartala

15.NIT Hazratbal

16.NIT Raipur

Good luck!!

Hello Aryan,

The admission authority will release the cutoff for top B.Tech branches of NITs for the admission of candidates in different NITs through JEE Main. 

Factors determining the NITs cutoff for top B.Tech branches

• Total number of applications received for the admission in the institute
• Total number of candidates appearing for the JEE Main exam
• Number of B.Tech seats available
• The difficulty level of the JEE Main 2019 exam
• Previous years’ cutoff trends

I would suggest you visit the careers360's link given below for detailed info of the cutoff

The link for the same is:https://engineering.careers360.com/articles/nits-cutoff-for-top-btech-branches

Hope this helps and all the very best!