Which IIT can I get in 43 marks in gate 2018 , civil engineering (OBC category)?

Hello Nikhil,
First of all very very congratulations on your great achievement in examination of GATE. 4300 call which can get you to annual engineering institute in India except a few IITs.
Depending on which your branch is he can have admission in most of the National Institute of Technology is in India including NIT Rourkela NIT Surathkal NIT Trichy etc. But just don't lose hope be sure that you will Excel in which ever college you get. Thank you so much for reading and best of luck for your future.

I am afraid Nitin but you cannot get a reputed IIT with this score even after your reservation quota so you can't get into IIT with this score. But surely you can get a good NIT with this score. Good Luck :)