Complete Guide to UPSC CDS 2027 detailed syllabus subject wise pdf 2026

What is the Exam?

The Combined Defence Services (CDS) examination is a prestigious, national-level competitive exam conducted twice a year by the Union Public Service Commission (UPSC). Its primary objective is to recruit eligible graduates as commissioned officers into the Indian Armed Forces.

Successful candidates are inducted into the Indian Military Academy (IMA), Indian Naval Academy (INA), Air Force Academy (AFA), and the Officers' Training Academy (OTA). The selection process is a rigorous two-tier system consisting of a written examination followed by the Service Selection Board (SSB) interview, which evaluates a candidate’s psychological, physical, and leadership attributes. Achieving a commission through the CDS exam is a highly coveted milestone for aspirants aiming to serve the nation with honor and pride.

Key Highlights 2026

For aspirants targeting the 2027 cycle, understanding the 2026 trends is crucial. The exam remains a gateway to Permanent and Short Service Commissions. Key highlights for the current cycle include:

• Conducting Body: Union Public Service Commission (UPSC)
• Frequency: Twice a year (CDS I and CDS II)
• Mode: Offline (Pen and Paper)
• Selection Stages: Written Exam and SSB Interview
• Languages: English and Hindi (for GK and Mathematics)
• Negative Marking: 1/3 of the marks assigned to the question
• Total Vacancies: Over 450+ vacancies (varying by cycle)

Syllabus 2026

The UPSC CDS syllabus is designed to test your command of language, general awareness, and mathematical proficiency. Below is the breakdown of the syllabus as per the latest UPSC standards.

Subject-Wise Syllabus Breakdown

Subject	Key Topics
English	Grammar, Reading Comprehension, Cloze Test, Spotting Errors, Synonyms & Antonyms, Idioms & Phrases, Para Jumbles, Sentence Improvement
General Knowledge	Current Affairs, History (Ancient, Medieval, Modern), Geography (Physical, Social, Economic), Indian Polity, Constitution, Economy, General Science (Physics, Chemistry, Biology)
Elementary Mathematics	Arithmetic (Number Systems, Percentages, Profit & Loss), Algebra, Geometry, Trigonometry, Mensuration, Statistics

Exam Pattern

The structure of the paper depends on the academy you are applying for. IMA, INA, and AFA require a Mathematics paper, whereas OTA does not.

Pattern for IMA, INA, and AFA

Subject	Questions	Marks	Duration
English	120	100	2 Hours
General Knowledge	120	100	2 Hours
Elementary Mathematics	100	100	2 Hours
Total	340	300	6 Hours

Pattern for OTA

Subject	Questions	Marks	Duration
English	120	100	2 Hours
General Knowledge	120	100	2 Hours
Total	240	200	4 Hours

Eligibility Criteria

Eligibility is strictly enforced by UPSC. Candidates must ensure they meet these requirements before applying:

• Nationality: Must be an Indian citizen, a subject of Bhutan or Nepal, or a Tibetan refugee who settled in India before January 1, 1962.
• Age Limit: Generally between 19 and 25 years. Specifics vary by academy (e.g., INA 19–22, IMA/OTA 19–24).
• Educational Qualification:
  • IMA/OTA: Bachelor’s degree from a recognized university.
  • INA: Degree in Engineering.
  • AFA: Degree with Physics and Mathematics at the 10+2 level or a Bachelor of Engineering.
• Physical Standards: Candidates must be physically fit as per the guidelines prescribed by the Ministry of Defence. This includes height, weight, and vision standards (which are particularly stringent for the Air Force).

Application Process

1. Visit Official Website: Navigate to the UPSC official portal (upsc.gov.in).
2. Registration: Complete the Part-I registration using your basic details.
3. Application: Fill out the detailed Part-II application, select your preferred exam center, and upload the necessary documents.
4. Fee Payment: Pay the application fee through the online gateway (exempt for female/SC/ST candidates).
5. Print Confirmation: Save the final application form for future reference.

Preparation Strategy

Success in the CDS exam requires a balanced approach between concept building and consistent practice.

• Foundational Clarity: Use NCERT textbooks for History, Geography, and Science. For Mathematics, rely on standard competitive exam books covering Class 10 level concepts.
• English Proficiency: Build your vocabulary daily and focus on grammar rules to handle 'Spotting Errors' and 'Sentence Improvement' effectively.
• Current Affairs: Dedicate at least 30 minutes daily to reading newspapers like The Hindu or Indian Express to keep track of national and international developments.
• Practice Regularly: Leverage Exam Bhai free mock tests to simulate the exam environment. Analyzing your performance in these tests will help you identify weak areas and improve your time management skills.
• Previous Year Papers: Solving papers from the last 5 years is the best way to understand the question patterns and difficulty level.

Cut-Off Trends

The cut-off marks vary significantly based on the difficulty level of the paper and the number of vacancies. Historically, the Air Force Academy (AFA) often sees the highest cut-offs.

For a secure position, target scores are usually 150+ for IMA/INA/AFA and 120+ for OTA in the written examination. Remember that the SSB interview marks (300) are added to the final merit list, so do not neglect your personality development and communication skills.

Frequently Asked Questions

Q1: Is there a limit on the number of attempts for the CDS exam? Ans: There is no specific limit on the number of attempts. You can appear for the exam as long as you fulfill the age and educational eligibility criteria.

Q2: Can final-year graduation students apply for CDS 2027? Ans: Yes, candidates in their final year of graduation are eligible to apply, provided they submit proof of passing the degree at the time of the SSB interview.

Q3: Is the syllabus for OTA different from IMA? Ans: The syllabus is identical; however, the OTA exam paper excludes the Elementary Mathematics section. You only appear for English and General Knowledge.

Q4: How do I access the detailed syllabus PDF? Ans: You can download the official detailed syllabus PDF directly from the UPSC website under the 'Examinations' tab or visit the Exam Bhai resource section for a summarized, easy-to-read version.

Q5: Is there any reservation for OBC/SC/ST candidates in CDS? Ans: Unlike Civil Services, the CDS exam does not have category-wise reservation for the written exam cut-off. All candidates are evaluated on a common merit basis.

Q6: What is the marking scheme for the CDS exam? Ans: Each correct answer earns 1 mark, while 1/3 of a mark is deducted for every incorrect response. Unattempted questions do not attract any penalty.