Hello Suvidha,
There is no restriction from the side of UPSC, or hard and fast rules. There is a common conception that the humanities are more preferable, but IIT engineers topping the exam in recent years, and even doctors cracking it, prove that all streams prepare you equally well.
dear student,
First of all, if you think that you want to be an IAS then I will suggest you to go for Bachelor In Arts.
You can take majors Political science or sociology.
This subjects help one to crack any government exams like UPSC, SSC CGL and State Public Comission Exams and RRB too.
hope it helps
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