Hey Daipayan.

The unofficial answer key of JEE Main paper1 was released yesterday some hours after the exam was over. You can check it kn the link below.

https://engineering.careers360.com/articles/jee-main-official-answer-key

The official answer key will be released on 24 April, 2018.

Hope this helps. All the best. 

hello Daipayan,

CBSE will release official answer key of JEE Mains Examination on 24th April, 2018. The answer keys &photos of response sheets of candidates (OMR sheets) of Pen & Paper Based examination and answer keys of Computer based examination will be displayed on the website www.jeemain.nic.in during 24th - 27th April, 2018.

Good Luck.