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CDS

Combined Defence Services Examination. CDS selects candidates for IMA, INA, AFA, and OTA. Three papers: English (120 Q), Elementary Mathematics (100 Q), and General Knowledge (120 Q), each 120 minutes. Negative marking of 1/3 applies. OTA candidates take English and GK only.

Authority: Union Public Service CommissionPattern reference: CDS 2026 referenceLast verified: 8 Aug 2026Official source

AISEA reviews these notes against the linked authority, but recruitment and examination rules can change between notifications. Always confirm the active cycle before applying.

Section breakdown

#SectionQuestionsTime
01English120120 min
02Elementary Mathematics100120 min
03General Knowledge120120 min

Timing and marking rules

3 papers (OTA: 2 papers). Each paper 100 marks, 120 min. Negative marking: −1/3 per wrong answer. Offline (pen and paper) OMR test. Followed by SSB (Services Selection Board) interview. IMA/INA/AFA: all 3 papers. OTA: English + GK only.

Topics by section

English

120 Q · 120 min
Spotting Errors Fill in the Blanks Synonyms Antonyms One Word Substitution Sentence ArrangementReading Comprehension Idioms and Phrases Change of Voice Change of Speech

Elementary Mathematics

100 Q · 120 min
Number System AlgebraGeometry (Lines, Angles, Triangles, Quadrilaterals, Circles)Mensuration StatisticsTrigonometrySimple and Compound Interest Percentage Time and Work Time and Distance

General Knowledge

120 Q · 120 min
Current AffairsHistoryGeographyPhysicsChemistryBiologyEconomicsIndian PolityDefence and National Security

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