Combined Defence Services Examination
Every branch is equivalent for Indian Armed forces. You must have good knowledge of your subjects that will help you in the selection process, specially in the interview. So it depends on your interset & capability. Mainly you can go for Civil, Electronics & Communication & Mechanical.
You can refer below books for CDS preparation:
Mathematics:1.CDS pathfinder book2.R.S Agarwal
English:1.R Gupta CDS book2.CDS pathfinder book3.Word Power Made Easy : Norman Lewis
General Knowledge: 1.Geography & History: NCERT (Std 6th-12th) 2.Polity: M laxmikant 3.Economy: NCERT (11th-12th) 4.International relations/events/diplomacy: Pratiyogita Darpan, The Hindu.
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