Conducted by the Union Public Service Commission (UPSC), the CDS examination is generally held twice each year for admission to:

• Indian Military Academy (IMA)
• Indian Naval Academy (INA)
• Air Force Academy (AFA)
• Officers’ Training Academy (OTA)

UPSC has already published its Annual Calendar 2027, while the detailed CDS 2027 notifications will contain the final vacancy numbers, exact date-of-birth ranges and academy-specific conditions.

This guide explains the complete CDS 2027 exam structure, including:

• CDS eligibility
• Educational qualification
• Age and marital-status requirements
• Academy-wise differences
• CDS exam pattern
• CDS syllabus
• SSB selection
• Medical examination
• Final merit process

What is the CDS Examination?

The Combined Defence Services Examination is conducted by UPSC for graduate candidates seeking entry into selected officer-training academies of the Indian Armed Forces.

Through CDS, eligible candidates can compete for admission to:

Indian Military Academy – IMA

For Permanent Commission in the Indian Army.

Indian Naval Academy – INA

For training toward a career as an officer in the Indian Navy.

Air Force Academy – AFA

For candidates aiming to join the Indian Air Force through the CDS route.

Officers’ Training Academy – OTA

For Short Service Commission training in the Indian Army.

CDS 2027 at a Glance

The detailed academy-wise vacancies and eligibility conditions will be confirmed only through the official CDS 2027 notifications.

CDS 2027 Eligibility Criteria

Eligibility depends on the academy you are applying for.

The main conditions include:

• Nationality
• Age
• Marital status
• Educational qualification
• Medical fitness

Candidates should always verify the final requirements in the respective CDS I 2027 or CDS II 2027 notification.

Educational Qualification for CDS 2027

Indian Military Academy – IMA

Candidates generally need a degree from a recognised university or equivalent institution.

Officers’ Training Academy – OTA

Candidates generally require a recognised university degree or equivalent qualification.

Indian Naval Academy – INA

Candidates normally need a degree in Engineering from a recognised university or institution.

This makes INA eligibility different from IMA and OTA.

Air Force Academy – AFA

For the Air Force Academy, candidates typically require a recognised degree along with the prescribed Physics and Mathematics background at the 10+2 level, or an eligible Engineering degree, subject to the exact notification conditions.

Because Air Force eligibility can depend on both graduation and school-level subjects, candidates should verify this carefully when the CDS 2027 notification is released.

Can Final-Year Students Apply for CDS?

UPSC CDS notifications generally allow eligible candidates who are studying in the final year or semester of their degree to apply, subject to documentary conditions and deadlines.

Candidates must provide proof of passing the required qualification within the period specified by UPSC.

Therefore, a final-year student should not assume that simply appearing for graduation automatically satisfies every academy’s requirement.

CDS 2027 Age Limit

The age limit differs between academies.

UPSC usually expresses age eligibility through specific date-of-birth ranges rather than only a general age statement.

This is important because the acceptable DOB range for:

• IMA
• INA
• AFA
• OTA

may not be identical.

As of September 2026, the detailed CDS 2027 notifications have not yet been published, so candidates should avoid relying on unofficial 2027 DOB cut-offs.

Once the official notification is released, verify the exact DOB range directly against your matriculation or equivalent certificate.

Marital Status in CDS

Marital-status conditions can differ by academy and entry.

For example, some CDS entries specify unmarried candidates, while OTA conditions can differ depending on the category and notification.

Because this is academy-specific, candidates should check the CDS 2027 notification instead of assuming one rule applies to all four academies.

CDS 2027 Exam Pattern

The written examination is not the same for every academy.

This is one of the most important things CDS aspirants should understand.

CDS Exam Pattern for IMA, INA and AFA

Candidates applying for:

• Indian Military Academy
• Indian Naval Academy
• Air Force Academy

write three papers.

UPSC’s CDS examination scheme confirms these three 100-mark papers for admission to IMA, INA and AFA.

CDS Exam Pattern for OTA

Candidates targeting the Officers’ Training Academy write only:

There is no Elementary Mathematics paper for OTA under the established CDS scheme.

This makes OTA preparation structurally different from IMA, INA and AFA preparation.

Is There Negative Marking in CDS?

Yes.

CDS objective papers use negative marking for incorrect answers.

Candidates should therefore avoid excessive random guessing.

Accuracy matters because an unnecessary incorrect attempt can reduce the effective score.

CDS 2027 English Syllabus

The English paper is designed to assess the candidate’s understanding of English and ability to use the language correctly.

Important preparation areas generally include:

• Grammar
• Vocabulary
• Sentence usage
• Reading comprehension
• Synonyms and antonyms
• Sentence correction
• Ordering of words or sentences
• Fill-in-the-blanks
• Error detection

The level is intended to test practical understanding rather than specialised literature knowledge.

CDS 2027 General Knowledge Syllabus

General Knowledge is a broad paper.

It can include areas such as:

• Current events
• History of India
• Geography
• Indian polity
• Economy
• General Science
• Defence-related developments
• International affairs

The paper rewards candidates who combine static knowledge with awareness of current events.

History

Important areas may include:

• Ancient India basics
• Medieval India basics
• Modern Indian History
• Revolt of 1857
• Indian National Movement
• Constitutional developments
• Independence movement

Modern History is particularly relevant because many CDS questions are linked to major events, leaders and movements.

Geography

Prepare:

• Physical geography
• Indian geography
• World geography
• Climate
• Rivers
• Mountains
• Agriculture
• Natural resources
• Population
• Important locations

Maps can be especially useful for Geography revision.

Indian Polity

Important areas include:

• Constitution
• Parliament
• President
• Prime Minister
• Judiciary
• Fundamental Rights
• Fundamental Duties
• Centre-State relations
• Elections
• Constitutional bodies

Economy

Candidates should understand basic concepts such as:

• Inflation
• GDP
• Banking
• Budget
• Taxation
• Monetary policy
• Fiscal policy
• Major economic institutions

Current economic developments can also be relevant.

General Science

Questions may cover fundamental concepts from:

• Physics
• Chemistry
• Biology
• Environment
• Everyday science

The level is generally closer to broad general understanding than advanced specialised study.

Current Affairs

Important areas include:

• National developments
• International affairs
• Defence
• Science and technology
• Space
• Awards
• Sports
• Appointments
• Important organisations
• Government initiatives

CDS Elementary Mathematics Syllabus

Elementary Mathematics is required for:

• IMA
• INA
• AFA

OTA candidates do not write this paper.

The standard broadly corresponds to school-level Mathematics.

Important areas include:

Arithmetic

• Number system
• Fundamental operations
• Percentage
• Ratio and proportion
• Profit and loss
• Simple interest
• Time and work
• Time and distance

Algebra

• Basic operations
• Polynomials
• Quadratic equations
• Simultaneous equations
• Laws of indices

Trigonometry

• Trigonometric ratios
• Standard values
• Identities
• Heights and distances

Geometry

• Lines and angles
• Triangles
• Circles
• Quadrilaterals
• Basic theorems

Mensuration

• Area
• Perimeter
• Surface area
• Volume

Statistics

• Data interpretation
• Mean
• Median
• Mode
• Basic graphical representation

CDS Selection Process 2027

The CDS selection process broadly involves four stages.

Stage 1 – Written Examination

Candidates first appear for the UPSC CDS written examination.

The required papers depend on the academy selected.

Stage 2 – SSB Interview

Candidates who qualify through the written examination may be called for testing by the Services Selection Board.

The SSB process broadly assesses officer potential through multiple activities.

What Happens During SSB?

The SSB process includes assessment through different stages and techniques.

Candidates may encounter:

• Screening tests
• Psychological tests
• Group tasks
• Personal interview
• Conference

The purpose is to assess qualities considered relevant for officer selection rather than purely academic knowledge.

Stage 3 – Medical Examination

Candidates recommended by the SSB must satisfy the prescribed medical standards.

Medical assessment can include areas such as:

• General physical condition
• Vision
• Hearing
• Height and weight
• Musculoskeletal health
• Other service-specific standards

The final medical standards depend on the academy and service.

Stage 4 – Final Merit List

Final selection depends on:

• Written examination performance
• SSB performance
• Medical fitness
• Eligibility
• Vacancy availability

Clearing only the written examination does not guarantee admission to an academy.

CDS Selection Flow

The overall pathway can be understood as:

Application → Written Exam → Written Result → SSB → Medical Examination → Final Merit → Academy Training

CDS 2027: Academy-Wise Comparison

Candidates should use this comparison only as an overview and verify exact 2027 eligibility in the official notification.

CDS I and CDS II

UPSC generally conducts CDS twice each year:

• CDS I
• CDS II

For example, CDS I 2026 was held on 12 April 2026, while CDS II 2026 was held on 13 September 2026.

UPSC has already published the 2027 Annual Calendar, so aspirants targeting CDS 2027 should use the official calendar for planning and then refer to the detailed notifications when released.

CDS Previous-Year Question Papers

UPSC publishes official previous-year CDS question papers.

For CDS I 2026, UPSC lists papers for:

• English
• General Knowledge
• Elementary Mathematics

These are useful for understanding the actual examination format and difficulty level.

Who Should Target IMA?

IMA is relevant for graduate candidates seeking a route toward Permanent Commission in the Indian Army, subject to eligibility.

Candidates must prepare:

• English
• General Knowledge
• Elementary Mathematics

followed by SSB and medical assessment if shortlisted.

Who Should Target INA?

INA is intended for candidates who satisfy the prescribed Engineering qualification and other eligibility conditions.

The written examination includes:

• English
• General Knowledge
• Elementary Mathematics

Who Should Target AFA?

AFA is relevant for candidates seeking entry into the Indian Air Force through CDS and who satisfy the required educational, age and other criteria.

Because educational requirements can involve both graduation and Physics/Mathematics background, candidates should check AFA eligibility particularly carefully.

Who Should Target OTA?

OTA is often an important option for candidates seeking Short Service Commission through CDS.

A major written-exam difference is:

OTA does not include Elementary Mathematics.

OTA candidates write only:

• English
• General Knowledge

This should influence how they structure their CDS preparation.

Common CDS Eligibility Mistakes

Assuming Every Academy Has the Same Qualification

They do not.

INA and AFA have additional educational conditions compared with the general degree requirement used for IMA and OTA.

Ignoring Date-of-Birth Cut-Offs

UPSC specifies exact DOB ranges.

Check them carefully once CDS 2027 notifications are published.

Preparing Maths for OTA

OTA candidates do not write the Elementary Mathematics paper.

Confusing Written Qualification with Final Selection

The written exam is only the first stage.

SSB, medical fitness and final merit also matter.

CDS 2027 with Vision Defence

At Vision Defence, CDS preparation can be structured according to the candidate’s target academy.

Candidates preparing for IMA, INA or AFA need coverage of:

• English
• General Knowledge
• Elementary Mathematics

OTA aspirants need focused preparation for:

• English
• General Knowledge

Alongside the written examination, candidates should also understand the larger selection journey involving SSB and medical standards.

Frequently Asked Questions

What is CDS 2027?

CDS 2027 refers to the Combined Defence Services examinations conducted by UPSC during the 2027 examination cycle.

How many times is CDS conducted?

UPSC generally conducts CDS twice each year as CDS I and CDS II.

Is CDS only for graduates?

CDS is a graduate-level entry examination.

Candidates must satisfy the academy-specific educational qualification stated in the notification.

Is Maths compulsory in CDS?

For IMA, INA and AFA, Elementary Mathematics is part of the written examination.

For OTA, there is no Mathematics paper.

How many marks is the CDS written exam?

For IMA, INA and AFA:

300 marks

For OTA:

200 marks

under the established UPSC written-exam scheme.

Can final-year students apply for CDS?

Eligible final-year degree students can generally apply subject to the documentary conditions and deadlines specified in the notification.

Is SSB compulsory after CDS?

Candidates who progress beyond the written stage must undergo the applicable Services Selection Board process for final selection.

Is the CDS 2027 notification released?

As of 22 September 2026, UPSC has published its Annual Calendar 2027, but detailed CDS 2027 examination notifications containing the final vacancies, DOB limits and academy-specific application conditions are still to be issued.

Final Takeaway

The CDS 2027 examination offers different routes into officer training, but the eligibility and written-paper requirements vary by academy.

The key distinction is:

IMA / INA / AFA → English + General Knowledge + Elementary Mathematics

OTA → English + General Knowledge

Before applying, candidates should carefully verify:

• Educational qualification
• Date of birth
• Marital-status conditions
• Academy preference
• Medical eligibility

Once the detailed CDS 2027 notification is released, use the official UPSC document as the final authority for eligibility and vacancies.

Understanding the correct academy requirements from the beginning helps you prepare specifically for the CDS pathway you actually intend to pursue.