CDS 1 Syllabus 2025: The Union Public Service Commission (UPSC) conducts the Combined Defence Service (CDS) twice every year. The CDS 1 notification 2025 has been released along with the detailed syllabus. The CDS syllabus is divided into three subjects, such as Maths, GK and English language.
The CDS Maths syllabus consists of Class 10th-level difficulty and contains topics such as natural numbers, integers, rational numbers, real numbers, etc., whereas CDS GK contains questions of Class 10th level difficulty, such as history, social science, geography, polity, current affairs, etc.
CDS 1 Syllabus 2025
Candidates applying for the announced vacancies should go through the detailed syllabus and make strategies accordingly. The CDS exam is conducted offline. Check the table below for the overview of the CDS syllabus.
| CDS Syllabus 2025 Overview | |
| Exam Conducting Body | Union Public Service Commission |
| Exam Name | Combined Defence Service and Naval Academy Examination, 2025 |
| Frequency | Twice a Year |
| Exam Mode | Offline |
| Papers in the CDS exam | Elementary Mathematics General Knowledge (GK) English Language |
| Exam Duration | 2 hours for each paper |
| Official Website | upsc.gov.in |
CDS 1 Syllabus 2025: PDF Download
Candidates preparing for the upcoming exam must also download the syllabus pdf. The important topics for the CDS syllabus are natural numbers, integers, rational numbers, real numbers, history, geography, polity, etc. Click on the direct link below to download the syllabus pdf.
| CDS 1 Syllabus 2025 |
CDS 1 Syllabus 2025: Important Topics
The CDS 2025 syllabus for the written exam is divided into three subjects, such as General Knowledge, Elementary Mathematics and English language. Candidates must go through the detailed syllabus and important topics before starting preparation. For admission to the Indian Military Academy, Indian Naval Academy and Air Force Academy, general knowledge, elementary mathematics, and the English language will be evaluated, whereas for admission to the Officers’ Training Academy, only English language and general knowledge will be evaluated.
Check the table below for CDS1 important topics.
| Topic | Subtopics |
| 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, Simple and Compound interest, Profit and loss, Ratio and proportion, Variation. |
| Elementary Number Theory | Division algorithm, Prime and composite numbers, Divisibility tests (2, 3, 4, 5, 9, 11), Multiples and factors, Factorisation theorem, H.C.F. and L.C.M., Euclidean algorithm, Logarithms (base 10), Laws of logarithms, Logarithmic tables. |
| Algebra | Basic operations, Simple factors, Remainder theorem, H.C.F., L.C.M., Polynomials, Solutions of quadratic equations (real roots), Relation between roots and coefficients, Simultaneous linear equations (analytical and graphical solutions), Simultaneous linear inequalities, Set language and notation, Rational expressions, Laws of indices. |
| Trigonometry | Sine, Cosine, Tangent (0° < × < 90°); Values of sin ×, cos ×, tan × (0°, 30°, 45°, 60°, 90°); Trigonometric identities, Trigonometric tables, Heights and distances. |
| Geometry | Lines and angles, Plane figures, Properties and theorems: Angles at a point, Parallel lines, Sides and angles of triangles, Congruency and similarity of triangles, Concurrence of medians and altitudes, Properties of parallelograms, rectangles, and squares, Properties of circles (including tangents and normals), Loci. |
| Mensuration | Areas: Squares, Rectangles, Parallelograms, Triangles, Circles; Surface area and volume: Cuboids, Right circular cones, Cylinders, Spheres. |
| Statistics | Collection and tabulation of data, Graphical representation: Frequency polygons, Histograms, Bar charts, Pie charts; Measures of central tendency. |
| English | Direct and indirect speech Sentence improvement Rearrangement of sentences Grammar and usage Fill in the blanks Comprehension passages Vocabulary Active and passive voices Jumbled sentences Error spotting Synonyms and antonyms Cloze test Idioms and phrases Parts of speech |
| General Knowledge | Sports Awards and honours Books and authors Major developments in the fields of politics Economics Social issues Ancient, mediaeval, and modern Indian history Indian national movement Growth of nationalism. Physical geography, Indian geography, and world geography Indian Polity and Governance Economic and Social Development Science and Technology Environmental Ecology and Biodiversity Defence and Security Issues Current Affairs: National and International News (Defence Focused) |
CDS 1 Exam Pattern 2025
Candidates must also check the CDs1 exam pattern 2025 to get insight into the exam format, number of questions, and maximum marks for each section. Familiarity with the CDS 1 Exam Pattern 2025 helps candidates to align their strategy. There shall be a negative marking of 1/3rd mark for each incorrect answer. Check the table below for the CDS exam pattern for the written exam.
| Admission to Indian Military Academy, Indian Naval Academy and Air Force Academy | ||
| Subject | Duration | Maximum Marks |
| English | 2 Hours | 100 |
| General Knowledge | 2 Hours | 100 |
| Elementary Mathematics | 2 Hours | 100 |
| Admission to Officers’ Training Academy | ||
| Subject | Duration | Maximum Marks |
| English | 2 Hours | 100 |
| General Knowledge | 2 Hours | 100 |
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