Hello Aanchal, 
The syllabus of UPES Dehradun comprises the syllabus of 11th and 12th.  The subjects are : Physics,  Chemistry and Mathematics  . Go thoroughly with the whole syllabus because UPESEAT paper is quite though also. 
The question paper have 50 questions each from Physics,  Chemistry and Mathematics. 30 questions from English language comprehension and 20 questions from current affairs and General Awareness. 
The link description; https://engineering.careers360.com/articles/upeseat-result
Hope it helps. 
Thank you. 

School Of Advanced Engineering, UPES, Dehradun

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