The Combined Defence Services (CDS) Examination is conducted by the Union Public Service Commission (UPSC) to select eligible candidates for officer training at the Indian Military Academy (IMA), Indian Naval Academy (INA), Air Force Academy (AFA) and Officers’ Training Academy (OTA). The examination is an opportunity for graduates and eligible final-year students to pursue a career as commissioned officers in the Indian Armed Forces.

The CDS 1 2027 examination is scheduled for 11 April 2027, according to the UPSC Annual Calendar 2027. The notification is scheduled for 2 December 2026, and the last date to apply is 22 December 2026. Candidates should begin their preparation by understanding the eligibility criteria, syllabus, exam pattern and selection process.

Major Kalshi Classes (MKC) provides defence examination preparation support to aspirants preparing for CDS and other competitive defence examinations. This guide covers the important details candidates need to plan their CDS 1 2027 preparation.

CDS 1 2027 Important Dates

The following dates are listed in the UPSC Annual Calendar 2027. The detailed notification will provide the final application instructions and examination requirements.

Candidates should check the official UPSC website regularly for updates regarding the notification, admit card, written result and SSB interview.

What Is CDS 1 2027?

CDS stands for Combined Defence Services. UPSC conducts the examination to select candidates for training at different defence academies. Depending on their eligibility and preferences, candidates can apply for the Indian Military Academy, Indian Naval Academy, Indian Air Force Academy or Officers’ Training Academy.

The written examination tests candidates in English, General Knowledge and Elementary Mathematics. Candidates applying for IMA, INA and AFA must appear for all three papers, while OTA candidates appear for English and General Knowledge.

Candidates who qualify in the written examination are considered for the Services Selection Board (SSB) interview, subject to the prescribed conditions. Final admission depends on merit, eligibility, medical fitness and the availability of vacancies.

CDS 1 2027 Eligibility Criteria

Before applying for CDS 1 2027, candidates should check their age, educational qualifications, nationality and marital status against the requirements for their preferred academy. The exact date-of-birth limits and other conditions will be specified in the official notification scheduled for 2 December 2026.

CDS 1 2027 Educational Qualification

Candidates in the final year of their degree course may also be eligible, subject to the conditions specified in the official notification and the requirement to submit proof of passing within the prescribed period.

CDS 1 2027 Age Limit

The age limit differs according to the academy. IMA, INA, AFA and OTA have separate age and marital status conditions. Candidates should not rely only on a general age range because UPSC specifies the acceptable dates of birth for each course in the notification.

For AFA, additional conditions may apply to candidates holding a valid Commercial Pilot Licence. Candidates must verify the applicable age, marital status, educational and other requirements before submitting an application.

Nationality and Other Requirements

Candidates must satisfy the nationality requirements prescribed by UPSC. The applicable rules cover Indian citizens and certain other categories specified in the notification.

Candidates must also meet the academy-specific physical and medical standards. Meeting the educational qualification alone does not guarantee eligibility for admission.

CDS 1 2027 Exam Pattern

The CDS written examination consists of objective-type questions. The number of papers and total marks depend on the academy selected by the candidate.

CDS Exam Pattern for IMA, INA and AFA

Candidates applying for IMA, INA and AFA must appear for all three papers. Each paper carries 100 marks and has a duration of two hours.

CDS Exam Pattern for OTA

Candidates applying for OTA do not have to appear for the Elementary Mathematics paper.

CDS 1 2027 Marking Scheme

The CDS examination uses negative marking for incorrect answers. The written examination consists of objective-type questions, and candidates should understand the marking scheme before attempting the papers.

• Correct answers receive marks according to the question's assigned value.
• Incorrect answers attract a penalty of one-third of the marks assigned to that question.
• No penalty is applied for questions left unanswered.
• Candidates must follow the examination instructions regarding the use of answer sheets and permitted materials.

For accurate preparation, candidates should consult the marking instructions in the official CDS 1 2027 notification.

CDS 1 2027 Syllabus

The CDS syllabus covers English, General Knowledge and Elementary Mathematics. Candidates should prepare according to the papers required for their chosen academy and revise the important topics regularly.

1. CDS English Syllabus

The English paper assesses candidates' understanding of the language, grammar, vocabulary and comprehension. Regular reading and practice can help improve accuracy and time management.

Important topics include:

• Reading comprehension
• Spotting errors
• Sentence improvement
• Fill in the blanks
• Synonyms and antonyms
• Word usage and vocabulary
• Ordering of sentences
• Sentence completion
• Idioms and phrases
• Grammar and sentence structure

Candidates should practise previous-year questions to understand how these topics are tested in the examination.

2. CDS General Knowledge Syllabus

The General Knowledge paper covers subjects related to current affairs, history, geography, science and other areas of general awareness. Candidates should build a strong foundation in static subjects while keeping up with important national and international developments.

Important topics include:

• History: Ancient, medieval and modern Indian history, the freedom movement and important historical events.
• Geography: Physical geography, Indian geography, climate, rivers, resources and world geography.
• Indian Polity: Constitution, fundamental rights and duties, Parliament, the executive and the judiciary.
• Economics: Basic economic concepts, the Indian economy, banking and important economic developments.
• General Science: Fundamental concepts in Physics, Chemistry and Biology.
• Current Affairs: Important national and international events, government initiatives, awards, sports and defence-related developments.

Candidates should revise static General Knowledge alongside current affairs rather than depending entirely on short-term notes.

3. CDS Elementary Mathematics Syllabus

Elementary Mathematics is required for candidates applying to IMA, INA and AFA. The standard of this paper is generally at the matriculation level.

Important topics include:

• Arithmetic: Number systems, integers, fractions, decimals, percentages, ratio and proportion, time and work, time and distance, profit and loss, and simple and compound interest.
• Algebra: Basic operations, factorisation, polynomials, quadratic equations, indices and logarithms.
• Trigonometry: Trigonometric ratios, standard identities, trigonometric values and heights and distances.
• Geometry: Lines and angles, triangles, quadrilaterals, circles and other geometrical properties.
• Mensuration: Areas and volumes of common two-dimensional and three-dimensional figures.
• Statistics: Data collection, graphical representation, measures of central tendency and related concepts.

Candidates should practise calculations regularly and focus on accuracy. Solving questions within a fixed time limit will also help improve performance.

CDS 1 2027 Selection Process

The CDS selection process involves the written examination, SSB interview, medical examination and final merit list. Candidates must satisfy the prescribed requirements at every stage to be considered for admission.

Stage 1: Written Examination

Candidates first appear for the CDS written examination. The papers depend on the academy selected in the application. Candidates must qualify according to the applicable standards and meet the other eligibility requirements.

Stage 2: SSB Interview

Candidates who qualify in the written examination are called for the SSB interview, subject to the applicable conditions. The SSB process assesses suitability for a career as an officer in the Armed Forces.

The SSB process generally consists of two stages.

Stage I: Screening Test

• Officer Intelligence Rating (OIR) tests
• Picture Perception and Description Test (PP&DT)

Candidates who qualify Stage I proceed to Stage II.

Stage II: Assessment

• Psychological tests
• Group Testing Officer (GTO) tasks
• Personal interview
• Conference

The assessment considers candidates' suitability for officer training. Candidates should prepare by developing communication, reasoning, awareness and problem-solving skills rather than focusing only on memorising answers.

Stage 3: Medical Examination

Candidates recommended by the SSB undergo a medical examination according to the prescribed standards. Medical fitness is an important requirement for admission to the respective academy.

Stage 4: Final Merit List

UPSC and the relevant authorities prepare the final merit list according to the applicable rules, examination performance, SSB marks, eligibility, medical fitness and available vacancies. Qualifying the written examination or receiving an SSB recommendation does not automatically guarantee final admission.

CDS 1 2027 Preparation Strategy

A structured preparation plan helps candidates cover the syllabus, revise important concepts and identify weak areas before the examination. Since CDS 1 2027 is scheduled for 11 April 2027, aspirants should establish a consistent study routine and monitor their progress through regular practice.

1. Understand the Syllabus and Exam Pattern

Start by reviewing the syllabus and examination pattern. Candidates preparing for IMA, INA and AFA should allocate time to all three subjects, while OTA candidates should focus on English and General Knowledge.

2. Prepare a Realistic Study Timetable

Divide your available study time among the subjects according to your strengths and weaknesses. Set daily and weekly targets for completing topics, revising concepts and practising questions.

3. Practise Previous-Year Question Papers

Previous-year papers help candidates understand question formats, recurring topics and the level of difficulty. Attempt papers under timed conditions and review every incorrect answer.

4. Take Regular Mock Tests

Mock tests help improve speed, accuracy and time management. Analyse your results after each test to identify topics that require additional practice. Avoid taking tests without reviewing your mistakes.

5. Strengthen English and General Knowledge

Read regularly to improve comprehension and vocabulary. For General Knowledge, combine static subjects with current affairs revision. Make concise notes that can be revised quickly before the examination.

6. Improve Mathematics Accuracy

Candidates appearing for the Mathematics paper should practise arithmetic, algebra, geometry, trigonometry and mensuration. Focus on understanding methods and solving questions accurately instead of relying only on shortcuts.

7. Begin SSB Preparation Early

Develop communication skills, stay informed about current affairs and practise reasoning exercises. Understanding the SSB process early can help candidates prepare alongside their written examination studies.

Prepare for CDS 1 2027 with Major Kalshi Classes

Major Kalshi Classes (MKC) supports aspirants preparing for defence examinations, including CDS, NDA, AFCAT and other competitive examinations. Candidates preparing for CDS 1 2027 should follow a planned study schedule, practise previous-year papers, assess their progress through mock tests and revise consistently.

A focused preparation approach can help candidates build subject knowledge, improve examination performance and prepare for the next stage of selection. Aspirants should also understand the SSB process and the requirements of their preferred academy.