Hey !

In order to apply for an admission in class 9 , first one should make sure he/she passes class 8 from a recognized school and also be between the age 13-15. You can then contact the school you're interested in or visit their official website to know if class 9 admissions have begun or not. In the mean time you can also prepare the marksheet of class 8, TC, Birth certificate, a valid ID proof and passport size-photo.