A career in Defence Services is the much sought after occupation today for those young and courageous youths of the country who are willing to dedicate their lives to defend the country and its people. The Combined Defence Services Examination is the first test before they can join one of the best Defence forces in the world i.e. the Indian Armed Forces.
UPSC conducts the Combined Defence Services Exam twice every year generally in February and August for Recruiting officer’s for the Indian Military Academy, Naval Academy, Air Force Academy and Officers Training Academy.
Male candidates can join IMA, Naval and Air Force but for female candidates OTA in army is available.
The examination comprises of two stages:
First stage consists of written test and those who qualify the written test are called for interview by Service Selection Board (SSB) for Intelligence and Personality Test.
Age Limit, Sex and Marital Status
1. For IMA and Indian Naval Academy: Unmarried Male candidates having age not less than 18 years on 1st July and not more than 23 years on 2nd July in accordance with the year of examination are eligible.
2. For Air Force Academy: Male candidates having age not less than 19 years as on 1st July and not more than 23 years as on 2nd July in accordance with the year of examination (upper age relation of upto 26 years for candidates holding Commercial Pilot License issued by DGCA).
3. For Officer’s Training Academy: Male candidates (married or unmarried) and female candidates (unmarried and issueless widows or divorces who have not remarried) having age not less than 18 years as on 1st July and not more than 24 years as on 2nd July in accordance with the year of examination are eligible.
Education Qualification
1. For IMA/OTA a degree from a recognized university or equivalent.
2. For Naval Academy degree in engineering from a recognized university.
3. For Air Force Academy degree from a recognized university (with Physics and Mathematics at 10+2 level) or Bachelor of Engineering.

Syllabus
The written examination will be as follows:
Subject Duration No. of Ques. Max Marks
English 2 hours 120 100
General Knowledge 2 hours 120 100
Elementary Mathematics 2 hours 100 100

The syllabus is broadly classified into three subjects namely – English, General Knowledge and Elementary Mathematics.
The level of questions in Mathematics is set according to the standard of matriculation i.e. 10th Standard. However, for other subjects, the level of questions will be of graduation level.
The syllabus for English Language is designed to test the basic understanding or English Language. Some of the topics are:
• Antonyms
• Synonyms
• Spotting Errors
• Sentence Improvement
• Word Substitution
• Selecting Words
• Comprehension
• Ordering of Sentences
• Ordering of words in a Sentence

The syllabus for General Knowledge is designed to test the candidate’s knowledge of current events happening in India and around the World. Some of the topics are:
• Current Awareness
• History
• Politics
• Economics
• Geography
• Environment
• Culture
• Biology
• Physics
• Chemistry
• Sports
• Books
• Defence
• Awards
• Personalities

The syllabus for Elementary Mathematics includes questions from Arithmetic, Algebra, Geometry, Mensuration, Trigonometry and Statistics. Some of the topics included are:
1. Algebra
• Polynomials
• Factorisation
• HCF & LCM
• Quadratic Equations
• Identities based Questions
• Set Language and Set Notation
• Law of Indices
2. Number System
• Natural numbers
• Integers
• Rational and Real Numbers
• Fundamental operations of addition, subtraction, multiplication and division
• Fractions
• Time and Work
• Percentage
• Simple interest and Compound Interest
• Profit and Loss
• Ratio and Proportion
3. Trigonometry
• Trigonometric Identities
• Heights and Distance
4. Geometry
• Lines and angles
• 2D figures
• Triangle and its properties
• Circle and its properties
• Quadrilaterals like parallelogram, rectangle, square or trapezium
5. Mensuration
• Areas of squares, rectangles, parallelograms, triangles or circles
• 3D figures like cubes and cuboids, Cones, cylinders or spheres.
6. Statistics
• Collection and Tabulation of Statistical Data
• Graphical Representation Frequency Polygons
• Histograms
• Bar Charts

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