Difficulty level of any exam will depend on your preparedness for exam . Both UPESMET and MAT have same exam pattern Without proper preparation and dedication towards the subject, you won’t be able to secure a good rank. UPES also offers admission to students based on their MAT score, so instead of comparing the difficulty level, I would advise you to focus more on the subjects and syllabus you need to cover for the entrance. Prepare with dedication and you can ace any of these exams. 

Hi 

MAT is much more tougher I would suggest you to study both prep material as you will get a more comprehensive idea and help in studying the whole thing 

ALl the best to you