Unacademy Plus Mrunal Economy for Prelims and Mains UPSC!

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.

Indian History Freedom Struggle Pratik Nayak