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CDS Syllabus
Combined Defence Services (CDS) Examination is conducted by UPSC twice a year to select officers for the Indian Military Academy (IMA), Indian Naval Academy (INA), Air Force Academy (AFA), and Officers Training Academy (OTA). Candidates undergo service-specific training and are commissioned as officers in the Indian Armed Forces.
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Students preparing for CDS
View all Formula of the day
Maths · Quadratics · 9 formulae in the cheatsheet
Trap of the day
nPr is ordered (arrangements), nCr is unordered (selections). “Arrange” → P, “choose” → C.
Revision & Exam Traps· 9 formulae · 4 traps
Maths · Quadratics
Check the discriminant first: D>0 two real roots, D=0 equal, D<0 none. Don’t solve before checking nature.
Maths · Differentiation
Maths · Integration
Maths · Progressions
Maths · Coordinate Geometry
Maths · Trigonometry
sin²θ means (sinθ)², not sin(θ²) — a notation trap that changes the value.
Maths · Permutations & Combinations
Maths · Probability
Maths · Binomial Theorem
Maths · Counting
nPr is ordered (arrangements), nCr is unordered (selections). “Arrange” → P, “choose” → C.
Strategy
CDS Elementary Maths rewards speed on basics — percentages, ratio, mensuration, time-work. Don’t over-invest in one hard sum.
CDS Syllabus (2025)
9 subjects · 68 topics
Select a topic from the list to start revising.