The Combined Defence Services (CDS) Examination is conducted twice a year by the UPSC for recruitment into the Indian Military Academy, Officers Training Academy, Indian Naval Academy and Indian Air Force Academy. The Notification for the examination is usually released in the months of October and June, and the examinations are conducted in February and November respectively. Only unmarried graduates are eligible to sit for the exam. Successful candidates are admitted into the respective Academies after an interview conducted by the Services Selection Board (SSB).
CDS-SSB Exam

Parameters for CDS - SSB Exam
Indian Military Academy – 19–24years
Air Force Academy – 19–24 years
Naval Academy – 19–24 years
Officers’ Training Academy – 19–25 years.
English – 100
General Knowledge – 100
Elementary maths – 100
Total Marks – 300
English – 100
General Knowledge – 100
Total Marks – 200