The Notification for the CDS written exam is issued in the months of November and July. UPSC holds the exam in the months of Feb and October. Students can apply for the CDS and OTA written examination online only on UPSC website.
NDA and NA written entrance examination is conducted by UPSC twice a year. Notification for the exam appears in all major national dailies in the month of Dec/Jan for the April exam and in the months of May/June for the September exam. The exam is held in the months of April and September. Candidates must apply to sit for the examination, online on the UPSC website after notification is released by UPSC.