https://youtu.be/4AnZKgn-UzM -check here

Also you can check the paper in the youtube channel- IIT & Science

I couldn't find the unofficial key of jee paper 2 2018 in any website

The unofficial answer key of Jee Mains by some coaching institutes will be releasing in a few days .....

And the official jee mains answer key will be released in the last week of may 2018 by the CBSE..

Good Luck !!!!