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

Note that KCET finished today only (20th April) having started on the 18th of April.

I would like to direct your attention to this Careers360 article for regular updates on the answer keys of KCET 2018 as and when the coaching institutes release the answer key:

• https://engineering.careers360.com/articles/kcet-answer-key

Also, please see here for an analysis of the same:

• https://www.deccanchronicle.com/nation/current-affairs/200418/kcet-heat-takes-toll-on-students-parents.html

Hope this helps you and all the best! 

KCET is conducted every year for admission in government/university/private aided private un-aided professional educational institutions in the state of Karnataka. 
All the best!!