CDS means Combined Defense Service. This exam is conducted by UPSC twice in a year. Generally it is conducted first time in February and second time in the month of November. The candidates who have applied for the November 2017 exam have very less time left. Those who are appearing for CDS Exam for the first time they should know the syllabus. Syllabus is divided according to the posts they intend to opt after cracking the exam as shown in the tables below: CDS Syllabus for IMA, AFA courses Written Exam for Indian Military Academy, Naval Academy and Air Force Academy Paper Subject Name Marks Duration 1 English 100 2 hours 2 General Knowledge 100 3 Elementary Mathematics 100 Total 300 CDS Syllabus for OTA Courses Written Exam for Officers’ Training Academy Paper Subject