Hello applicant,

* Firstly I wanna talk about the UPSC exam it is  nationwide competitive examination in India conducted by the Union Public Service Commission for recruitment to various Civil Services of the Government of India, including the Indian Administrative Service, Indian Foreign Service, and Indian Police Service

*UPSC is one of the toughest exams in india and thus students feel it hard to crack with graduation. If you are preparing for engineering it is advised to focus on engineering as the course is tough itself. Also in interview they may ask regarding your engineering discipline and may check as if you completed engineering sincerely or not as they judge your personality on that basis. you can do GK, easily with studies and if you can steal time from your engineering then can go for polity, history and others too.

*You can't clear UPSC while studying engineering .So, you have  to complete the engineering first and then you have plenty of time to study UPSC

Hope it helpful