About CDS:
CDS is conducted by Union Public Service Commission (UPSC) twice a year for graduate candidates who wish to pursue their career as commissioned officers in Army, Navy and Air Force.
CDS Exam Pattern 2017  The exam pattern of CDS 2017 will help candidates know detail of exam like questions pattern, number of questions, syllabus, marking scheme, exam duration and other details. The CDS exam pattern 2017 helps candidates to prepare well for the exam so to score good marks. As per CDS 2017 exam pattern, the exam will conducted in pen and paper based mode and each paper will be of 2 hours. Candidates appearing for CDS 2017 can check below the detailed information related to paper pattern, number of questions, subjects, marking scheme, syllabus, etc.
Candidates who will qualify the CDS 2017 written exam will be called for Services Selection Board (SSB) for Personality cum Psychometric tests and Intelligence Interview. CDS SSB interview is a five days process which evaluates personality, compatibility and potential of candidates for recruitment in the Army, Navy and Air Force.
Candidates can check the detail of CDS 2017 Exam Pattern from the table given below.
CDS Paper Pattern 
Features 
CDS 2017 Exam Phases 

Exam Duration 
2 Hours for each paper 
Exam Mode 
Pen & Paper Based Mode 
Language of Paper English 
English & Hindi (Both language except Hindi) 
Types of question (MCQ) 
Multiple Choice Question (MCQs) 
Question Booklet 
There will be four sets of question booklet namely A,B, C and D. Candidates will get question booklet randomly 
Number of questions 
340 MCQs for – IMA, INA and AFA 240 MCQs for – OTA 
Distribution of questions 
*Maths is not applicable for candidates applied for OTA 
Marking Scheme 
The maximum marks allotted to the written examination and to the interviews will be equal for each course i.e. the maximum marks allotted to the written examination and to the interviews will be 300, 300, 300 and 200 each for admission to the Indian Military Academy, Indian Naval Academy, Air Force Academy and Officers’ Training Academy respectively 
Negative Marking 

CDS Syllabus: The booklet of CDS 2017 will have questions from Maths, General Knowledge and English. The elementary Mathematics will be of Matriculation level while the standard of papers in other subjects will be of a graduate of an Indian University.
CDS Syllabus for English
The question paper will be designed to test the candidates' understanding of English and workmanlike use of words 
CDS Syllabus for General Knowledge
Latest Current Affairs, Indian Constitution, Indian History, Indian Economy, Indian Geography, Indian Politics, Indian Navy & Military, Religions, Books & Authors, Sports, Awards, Statement true/false etc. 
CDS Syllabus for Elementary Mathematics
Arithmetic: Number System  Natural numbers, Integers, Rational and Real numbers. Fundamental operations, addition, subtraction, multiplication, division, Square roots, Decimal fractions. Unitary method, time and distance, time and work, percentages, applications to simple and compound interest, profit and loss, ratio and proportion, variation Elementary Number Theory  Division algorithm. Prime and composite numbers. Tests of divisibility by 2, 3, 4, 5, 9 and 11. Multiples and factors. Factorisation Theorem. H.C.F. and L.C.M. Euclidean algorithm. Logarithms to base 10, laws of logarithms, use of logarithmic tables Algebra  Basic Operations, simple factors, Remainder Theorem, H.C.F., L.C.M., Theory of polynomials, solutions of quadratic equations, relation between its roots and coefficients (Only real roots to be considered). Simultaneous linear equations in two unknown  analytical and graphical solutions. Simultaneous linear in equations in two variables and their solutions. Practical problems leading to two simultaneous linear equations or in equations in two variables or quadratic equations in one variable & their solutions. Set language and set notation, Rational expressions and conditional identities, Laws of indices. Trigonometry: Sine x, cosine x, Tangent x when 0° <_x < 90° Values of Sin X, Cos X And Tan X, For X = 0°, 30°, 45°, 60° and 90°, Simple trigonometric identities, Use of trigonometric tables, Simple cases of heights and distances Geometry: Lines and angles, Plane and plane figures, Theorems on (i) Properties of angles at a point, (ii) Parallel lines, (iii) Sides and angles of a triangle, (iv) Congruency of triangles, (v) Similar triangles, (vi) Concurrence of medians and altitudes, (vii) Properties of angles, sides and diagonals of a parallelogram, rectangle and square, (viii) Circles and its properties including tangents and normals, (ix) Loci. Mensuration: Areas of squares, rectangles, parallelograms, triangle and circle. Areas of figures which can be split up into these figures (Field Book), Surface area and volume of cuboids, lateral surface and volume of right circular cones and cylinders, surface area and volume of spheres. Statistics: Collection and tabulation of statistical data, Graphical representation frequency polygons, histograms, bar charts, pie charts etc. Measures of central tendency 
What is CDS SSB:
Intelligence and Personality Test: The SSB procedure consists of two stage Selection process  stage I and stage II. Only those candidates who clear the stage I are permitted to appear for stage II. The details are:
Stage I comprises of Officer Intelligence Rating (OIR) tests are Picture Perception* Description Test (PP&DT). The candidates will be shortlisted based on combination of performance in OIR Test and PP&DT.
Stage II Comprises of Interview, Group Testing Officer Tasks, Psychology Tests and the Conference. These tests are conducted over 4 days. The personality of a candidate is assessed by three different assessors’ viz. Interviewing Officer (IO), Group Testing Officer (GTO) and Psychologist. There are no separate weightage for each test. The marks are allotted by assessors only after taking into consideration the performance of the candidate holistically in all tests. In addition, marks for Conference are also allotted based on the initial performance of the candidate in the three techniques and decision of the Board. All these have equal weightage.
As explained above, CDS preparation requires training for each of the areas of the written test of CDS namely English, Elementary Maths & General Knowledge