The “Combined Defence Services”Examination (CDS) is conducted twice a year by the Union Public Service Commission for recruitment into the Indian Military Academy, Officers Training Academy, Indian Naval Academy and Indian Air Force Academy.best-top cds classes in dehradun 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.best cds coaching center in dehradun .(top 5 navy AA,MR,SSR,AIRFORCE,X-GROUP,Y-GROUP,ARMY,CDS,NDA coaching center in india),Successful candidates are admitted into the respective Academies after an interview conducted by the Services Selection Board (SSB).