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!