Hello,

The eligibility criteria for UPSC is passed Bachelor's Degree in any discipline from a recognized university, hence there is no restriction in terms of belonging to any specific stream, people from various backgrounds such as Engineering, Medical, Commerce etc appear for UPSC CSE and qualify it as well, also you can have commerce and accountancy as your optional subject, so you can go ahead with this option, also when it comes to UPSC it's good to have a back up plan as well, and your course study will balance the both.