Jeevan, the official answer key for JEE Mains January session would be released tentatively in the third week of January. Although the experts have released the unofficial answer key and you can go through it from the given link: https://engineering.careers360.com/articles/jee-main-answer-key/amp

You can find the slot wise question papers and answer key there. For 8th January session 2 answer key, visit: https://learn.careers360.com/engineering/jee-main-2020-question-paper-with-solution-jan-8th-second-shift/