Hi Dipak,

You can appear for UPSC exam with having studied from any stream. There is no particular stream which is mandatory for UPSC exams. However, if you are in class 11th, then I'll recommend you to go for humanities/arts stream in class 11th and 12th as subjects taught there will help in your civil services exam. Also, you can visit the link below which will guide you in choosing the right stream for your career:

https://school.careers360.com/articles/which-stream-select-after-class-x

Hope this helps.. All the best