CBSE has only launched mock test, its answer key has not been provided.

JEE Main 2018 answer key will only be released for actual exam that will take place on 8th, 15th, 16th April 2018.

All the very best and good luck.

Hello Sailaja P. Thanks for contacting Careers360 and we hope we will be able to answer your query. 

Unfortunately, at mock tests, you do not get any answer key. This is because, the exam authorities just want you to get a feel of the examination. 

If you want any JEE Mains mock test papers with solutions, I would like to direct your attention to this Careers360 article:

• https://engineering.careers360.com/articles/jee-main-sample-papers

Hope this helps you and all the best!