RGPV is a government college and because of this all of the courses which it offers are quite good to get a well-reputed job. IT or CSE will be the best option if you want good placements. According to the recent placement highlights the average CTC offered at UIT RGPV is 3 LPA.
Now, whether you will be able to prepare for UPSC, along with your engineering degree or not, that depends on you.
Thus, you can prepare for UPSC if you really want to, and choosing IT will make it easy for you to lower the burden of academics.