Combined defense service exam is conducted twice every year.

Here are the useful links for preparation of GS, Maths and SSB Interview.

Studyplans/Free material

  1. General Awareness/GK Paper: studyplan, free material, previous cutoffs, physical standards
  2. Maths Paper: Number System, Quadratic Equations, Surds, Indices, Linear Equation (Part 1 of 3)
  3. Maths Paper: Percentages, profit-loss, Simple,Compound Interest rate,Time,Speed,Distance,Work and Statistics (part 2 of 3)
  4. Maths Paper: Geometry, Trigonometry, Mensuration, Area, Volume, Perimeter (Part 3 of 3)
  5. SSB Interviews: Dos and don’t, Tips, suggestions

Answerkeys with Explanations


  1. [Answerkey] CDS-2014: Geography, Environment-Biodiversity (EnB), Agriculture, Climate, Map related MCQs solved with explanation
  2. [Answerkey] CDS-2014: Science, Physics, Chemistry, Biology, Botany, Zoology, Heat, Motion, Optics, Electricity-MCQs solved with Explanation
  3. [Answerkey] CDS-2014: Polity, Constitution, Parliament related MCQs solved with explanation
  4. [Answerkey] CDS-2014: History Ancient, Medieval, Modern MCQs solved with explanation


  1. [Answerkey] CDS(II)2013: Polity, International Affairs, Misc.GK, PIN, Books, Sports: MCQs analysis & answers with explanations
  2. [Answerkey]CDS(II)2013:Geography, agriculture, Environment-Biodiversity MCQs- analysis & answers with explanations

When to apply?

The last date for applying in CDS(I)2014 is already gone. But  you can still wait for CDS(I) 2014.

  • Its notification will come on 19-7-2014,
  • Last date to apply will be 18-8-2014
  • and the exam will be held on 26-10-2014.

So, keep an eye on UPSC’s official website during that period.