The National Testing Agency (NTA) have been releasing the answer key for JEE Main. The key has been appearing at official website of NTA JEE. nta.ac.in and jeemain.nta.nic.in act as official website to exam. The response key is also appearing there along with answer key.
By paying Rs. 200, student can raise any query on answer key. The fees is for per query and it is non-refundable.