Updated on May 13, 2020 16:59 IST

By: Ruchika Kumari Chotrani 

One should formulate a plan and follow a cohesive approach to prepare for entrance exam like CDS.

CDS or Combined Defence Services examination is a national-level entrance test conducted by UPSC twice a year, first in February and the second one in November. It is conducted for the recruitment of candidates for the following defence academies. 

  1. Indian Military Academy (IMA)
  2. Indian Naval Academy (INA)
  3. Air Force Academy (AFA)
  4. Officers Training Academy (OTA)

For women/girls who are applying for CDS can only apply for the posts of OTA.

Exam Pattern for IMA, INA, AFA

Subject

Marks

Time

English

100

Two hours

General Knowledge

100

Two hours

Elementary Maths

100

Two hours

 Exam Pattern for OTA

Subject

Marks

Time

English

100

Two hours

General Knowledge

100

Two hours

The candidates should be aware of all the subjects and important topics to score well. The Syllabus of IMA, INA, AFA and OTA is the same.

General Knowledge

  • Current Affairs of last 5-6 months from the exam date
  • History
  • Physics
  • Biology
  • Geography
  • Political Science

English

  • Basic Grammar
  • Synonyms
  • Antonyms
  • Comprehension Solving
  • Error Spotting
  • Para Jumbles
  •  Idioms and Phrases
  • Vocabulary

Elementary Mathematics

  • Natural Number
  • Integers
  • Percentage
  • Rational and Real Number
  • Time and Work
  • Time and Distance
  • Profit and Loss
  • Ratio and Proportion
  • SI and CI
  • HCF and LCM
  • Geometry
  • Logarithm
  • Trigonometry
  • Statics
  • Mensuration

In case, you are preparing on your own, then remember one thing that you would not get the best study material of complete CDS Exam on one website or in a single book. Therefore, one has to create the best study material for them.

Here are some guidelines by which you can create a good study material:

  • Download monthly current affairs from the website “Lead the Competition”
  • Prepare notes on: Famous Books and its Author (recent year), National or Nobel Award Winners (recent year), Theories or Experiments (recent in news or discovered), States or Countries (recent in news).
  • History is a very vast subject; one could not study and memorise the whole history in a short period. So, try to do questions of all periods and dynasties in a categorised manner.
  • For Physics and Chemistry, refer NCERT books of Class 8, 9 and 10 and also, read Class 11 and 12 Physics and Chemistry from the handbook of the respective subjects.
  • Categorise Biology in three parts - Humans, Plants and Animals. Do not make detailed notes, instead, try to cover basics and do questions on them.
  • In Political Science, cover the following topics: Constitution, Our Preamble, Recent Schemes by Government, Changed Names of Places, Slogans and Taglines of Political Parties or Persons and Recent Historic Decisions or Bills (like CAA).
  • For English preparation, refer to Lucent English Book
  • For Maths, practise topics from NCERT books Class 7 to 10 and simultaneously maintain a separate copy for formulae and key points for last week revision.

Check here CDS books

Last week Revision Topics:

  • Physics: Motion, Work, Energy, Power, Gravitation, Heat, Electric Current, Laws, Oscillation and Waves.
  • Chemistry: Laws, Important Theories, Matter, Atomic Structure, Acids, Bases and Salts, Chemical Formula of Basic Salts, Polymers, Environment and Pollution, Solutions and Gas Laws, Radioactivity.
  • Biology: Cells, Genetics, Specification of Bones, Diseases and their Causes, Applied Biology, Pollination, Evolution and Molecular Biology.

Check here complete CDS preparation tips

About the Author:

Ruchika Kumari Chotrani

Ruchika Kumari Chotrani is pursuing B.Tech in Electrical Engineering (final year) from Arya College of Engineering and IT.

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Student Forum

chatAnything you would want to ask experts?
Write here...

Answered a month ago

Some of the books, help candidates in their CDS preparation are given below:

  • High School English Grammar & Composition Edition by Wren and Martin
  • Objective General English by SP Bakshi
  • Word Power Made Easy by Norman Lewis
  • English Grammar & Composition by S.C Gupta

J

Jasleen Jain

Contributor-Level 6

Answered a month ago


The authority released a total of 453 vacancies for the CDS 2 exam 2025 for admission to the Indian Air Force, Indian Military Academy, Indian Naval Academy, and Officers’ Training Academy for courses. 

M

Manisha Singh

Contributor-Level 6

Answered a month ago

It is advised to the candidates to reach the CDS exam centre one hour before the given time. They should carry hall ticket along with them otherwise they will not be able to give the exam.

C

Chanchal Shekhar

Contributor-Level 6

Answered a month ago

Yes, the English section of the CDS exam is scorable if it is prepared properly. Usually the difficulty level of the exam is moderate. 

S

Satyendra Garg

Contributor-Level 6

Answered a month ago

Candidates can check the cut off marks for the CDS exam by visiting the official website at upsc.gov.in. The UPSC will release the cutoff according to the academy or course.

S

Shikha Goyal

Contributor-Level 10

Answered a month ago

The methods to check the CDS cut off marks is provided below:

  • Visit at upsc.gov.in.
  • Click on the :Examination" tab.
  • Go to the "Cut Off Marks" dropdown menu.
  • Click on the download link and save it for future reference.

I

Ishita Kaur

Contributor-Level 6

Answered a month ago

Yes. In the CDS exam there is a negative marking. One-third mark will be deducted for an incorrect answer. No mark will be deducted for unanswered questions. 

S

Shikha Shukla

Contributor-Level 6

Answered a month ago

The CDS exam is conducted offline or pen and paper mode. Objective questions will be asked in the examination. Candidates need to mark their choices of answers in the sheet that was provided during the exam. CDS 1 2026 notification will be released on December 10.

 

 

J

Jasleen Jain

Contributor-Level 6

Answered 2 months ago

Yes, the CDS 2 application last date to apply was extended to June 20 from June 17, 2025. A one-time extension was provided by the commission. The application correction window was opened from July 7 to July 9, 2025.

S

Shikha Shukla

Contributor-Level 6