Combined Defence Exam I and II are no two different tiers of exam.UPSC conducts CDS exam twice in an year.CDS I is conducted during the start of the year and and CDS II is usually conducted to the end of the year.

Civil service Exam conducted by Union Public Service Commission is the most prestigious exam held in the country. It is conducted in three main stages; The Prelims ,Mains and the Interview. The preliminary exam is the first and the most important step to enter into civil service. The preliminary exam consists of two main papers; General Studies I and General Studies II .Both exams are of objective type question, carrying a maximum of 200 marks each. Paper I deals with events of National and Inte

National Defense Academy is a joint service academy for all the three forces the Army, the Navy and the Air force.Indian Naval Academy is an officer training academy for Indian Navy and Indian Coast Guard.

Indian Engineering Services is one of the toughest examinations held in our country. The exam is conducted by UPSC by a combined exam called the Engineering Services Exam .A Graduate in engineering or any other qualifications notified by UPSC can apply for the exam

Indian Forest Service exam is conducted by the UPSC to select candidates for the IFS cadre. UPSC recruits candidates every year for the post of IFS. The Indian Forest Service exam has three stages the Prelims , the Mains and the Interview. The preliminary exam is as same as the civil service exam conducted by the UPSC.The mains exam is not as same as the civil services exam,it is conducted differently by the UPSC .