As you want to get KEAM Previous Year Answer Key, so for it I am telling process here

Go on Commissionerate of Entrance Examinations (CEE) official website

Click on examination detail option given in KEAM 2015 option at the left hand side

By click there you will land on KEAM 2015 examination detial page which look like given below image





From that page you can get answer key of 2015 year

For your help here I am providing same

KEAM engineering 1



KEAM engineering 2


KEAM medical 1



KEAM medical 2