Hello,

First of all you're still in school, so there is long time to go for appearing in UPSC Civil Service Exam, you need to complete graduation in any discipline from a recognized university or you can apply even in the final year but you need to attain 21 years age, now coming to your question the syllabus  of UPSC is more humanities oriented there is no denial and yes pursuing simply BA or even BA degree in political science/public administration/history/geography/economics/law etc can be highly beneficial as these form core part of general studies and optional papers too come under these subjects, now whether to pursue this graduation degree or not is dependent on your choice, if you have any other professional choices such as engineering. or anything that comes within your domain(science stream), you can also go ahead with this choice especially if you want to explore other job profiles, you can check out the list of UPSC toppers, they come from diverse background such as engineering, medical, commerce etc , so you shouldn't think if you have different aspirations then you cannot qualify UPSC, yes those who have humanities background are already  acquainted with the syllabus in the sense a science or commerce students don't study these subject at 10+2 or graduation level, so I would say think clearly what is that you want , if it's only UPSC then go for BA Degree, if you're not sure at this moment fully then follow your aspirations, at later point if you still feel like appearing for UPSC, you can do that, eventually the focus, dedication and perseverance remain the same for every aspirant.