Hello Anandreddy, since from this year JEE mains was conducted fully online mode, so result will be declared early and as expected it will be out before 31 January. But from NTA there is no notification regarding answer keys of the paper so you have to wait for official answer keys from NTA. 

But yes you can download your shift's question paper and your response, I'm giving the link below please have a look.

https://www.google.co.in/amp/s/engineering.careers360.com/articles/jee-main-answer-key/amp

Good luck!!

Hope it helps