Hey Aspirant, previous year question papers for Jee mains paper 2 are easily accessible online.

But some site may misguide you.

I would recommend you to use careers360 site in order to access and easily download these papers for free.

You can refer to the link below for 2018 Jee main paper 2 question paper:

https://engineering.careers360.com/download/sample-papers/jee-main-2018-paper-2-question-paper-set-s

Hope this helps.

For any other query regarding this please ask in comments.