Hi Rakshit,
I think you mistyped, you are asking for UPSC exam.
Of course, yes a science student can write UPSC exam. In fact, a science student have advantage of having higher sitting power and longer study hours over the other stream student.
Refer here for more info - https://competition.careers360.com/exams/upsc-civil-services-exam
Feel free to ask doubts in the Comment Section.
I hope this information helps you.
Good Luck!
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