Hello,

You need to attain 21 years in order to appear for UPSC exam, there is no such restrictions in terms of belonging to any specific stream to appear for UPSC, you can be a graduate in any discipline from a recognized University, you can apply even in the final year, now coming to your question you come from science stream so if as of now you aren't sure about UPSC you may consider the idea of back up plan, you can pursue any course whether it's Medical or something of your choice, however if you're only focused on having UPSC as your career field, you can pursue graduation in subjects like political science, public administration, economics, geography etc, see whatever field you complete your graduation, eventually you will be eligible to appear, it's just that there are few factors to be taken into consideration as I mentioned above.

UPSC Civil Services Exam

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