If you are planning to seek admission in the Sainik School after class 10, your grades need to be good. They prepare their students in class-X and XII for CBSE Board as well as for UPSC exam for the National Defence Academy. The admission in the Sainik Schools is based on Entrance Exam and personal interview. The admissions are open for class 6 to class 9. There is a personal interview followed by the written test. You should focus mainly on your class 10 score in order to seek admission in class 11.