Dear aspirant,

As you have scored 343 marks and rank is 4260 so let me tell you it's very difficult to get the IITs . So as per my view you should try for nits like Jamshedpur, durgapur, Silchar, allahabad, rourkela, Calicut.

Although various factors are considered while deciding the cut offs like number of candidates appearing in the examination, number of vacant seats in college, previous years cut offs and difficulty level of the paper.

For more information you can check out the link given below-

https://engineering.careers360.com/articles/gate-cutoff/amp