Hello,

There is no restriction in terms of choosing any course for UPSC, if your only aim is to qualify this exam then perhaps with humanities stream you may have added advantage of being well acquainted with the subjects that are part of UPSC syllabus, but please do consider few things UPSC is highly competitive exam, it requires immense dedication, focus and perseverance to qualify this exam, hence you should also consider the fact that whether you want to have a back up plan or not, and it should be in accordance with your areas of interest, it's good that you're contemplating to appear for UPSC, to provide you an example many people from different field of engineering, medical, commerce, science gain experiences in their domain and then appear for UPSC, so you must take all these into consideration prior to making any decision about your graduation degree.