Hello dear,
For preparation for UPSC, you should do that course on college that it will cover your topics of UPSC. Since UPSC has wide range of topics so it will be better kf you could cover some of them in your college time.
You can do BA program or BA honors in any subject like history or political science which will be very beneficial for you for preparing for UPSC exams.
Thank you

Hey Praful, It is not like that for UPSC you require a particular course, a recognized Degree from a recognized college is sufficient. Whether you want to join engineering, medical, arts, commerce It doesnt matter, but that course should be degree. If you are determined that you want to go for UPSC exam after your degree choose arts or alike where you can get ample of time preparation and also somewhat similar subjects in curriculum as in UPSC syllabus.

If you go for Engineering there are many subjects and you have to give so much of time in college study and activities.

Arts and commerce will be a always good option. But make sure that from first year start basic reading like NCERT and any news paper. So use of time in these crucial years will help you get your goal.

I hope this will helps to you and thank you !!!