Dear Suraj
It will be better if you ask this question directly to admission counselor of UPES and its very simple. You just have to visit http://www.upes.ac.in There fill the query form and you are done.
As far as i know, they take Engineering Graduates with minimum 50%marks from a recognized University.
You need to have minimum CAT score of 75 Percentile or GMAT Score of 600 or MAT score of 80 Percentile or AICTE’s CMAT score to get exempted from UPES Management Entrance Test. You will be called for Group Discussion & Interview only. In case if you have not appeared for any of the above examination, you can go for May 2012 MAT or can wait for admissions test that will be held in the month of May'12 or June'12.