Yes of course you can appear for NDA examination if you fulfill the below eligibility criteria:

• Candidates must be between 16.5 and 19.5 years of age.
• Candidates having appeared or appearing in class 12 (10+2) examination are eligible to appear. 
• Male candidates who are unmarried can apply for the exam.

The subjects to be studied are:

• Physics
• Chemistry
• Geography
• General science
• Current affairs
• Mathematics
• Maths : Come on Buddy, when you will be preparing for JEE do u think those questions asked in NDA gonna hunt you . They are very straight forward just a basic knowledge would be enough solving them . Just solve some Mock papers to gain speed which will help to boost your marks .
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• General Science : Again you will be studying all possible laws and rules of Physics and Chem and in NDA they will just check your Knowledge about the topic not to solve the numerical. You will have to keep an eye on current affairs and gain some knowledge of Surrounding near you which will help you to go well for GK part . N see you will crack NDA
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• Coming To JEE
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• Just never leave your momentum for JEE, JEE requires extra effort just be punctual in your schedule . Best would be Keep your Focus on JEE and some efforts on NDA n it will be helpful .
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• Coming to SSB after clearing NDA written
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• You will get at leasta1 month time b/w your results and SSB so meanwhile Just buy a book for SSB preparation give at least 1 hour each day for your SSB preparation.
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• Practice for PPDT (make sure you won't come back on first day)
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• TAT, WAT : Best will be prepare a slide show as exactly followed in SSB giving 30 seconds interval to Pic and 4 minutes to write story following 11 such Pics and likewise for WAT too SRT : PRACTICE it and try to give short and crush response.
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• SDT: Prepare beforehand and memorize it
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• Follow some basic exercise like push ups and pull ups, running to keep you physically fit for GTO
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• In the Same SSB book you will get a section of Services details . Gain knowledge of the service you have applied for .
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• N rest is luck . Hope best

Hi student,

Yes of course you can appear for NDA examination if you fulfill the below eligibility criteria:

• Candidates must be between 16.5 and 19.5 years of age.
• Candidates having appeared or appearing in class 12 (10+2) examination are eligible to appear. 
• Male candidates who are unmarried can apply for the exam.

The subjects to be studied are:

• Physics
• Chemistry
• Geography
• General science
• Current affairs
• Mathematics

Hope it helps.

Good luck.