Hello,
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Firstly let me tell you about the paper division, NDA paper will be divided in 2 parts, mathematics and general ability. Mathematics questions will be based on 12th standard questions, and general ability has 7 subjects. Here i will help you with some of the syllabus and remaining syllabus you can get From the link,
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Mathematics

• Algebra
• Matrices and determinants
• Trigonometry
• Differential calculus
• Vector algebra

Physics

• Physical properties and states of matter
• Mass weight volume
• Reflection and refraction
• Weight
• volume

Chemistry

• chemical changes
• Oxygen
• Nitrogen and carbon dioxide
• Acids bases and salts
• Physical changes

General science

• Difference between living and non living cells
• Common epidemics
• Food source of energy

Don't forget to read news paper daily without missing any topic.

Follow the link below, for further subject and there syllabus.you can save the link for further uses as you can check once you complete a subject.
https://competition.careers360.com/articles/nda-syllabus/amp#aoh=15823883491917&csi=1&referrer=https%3A%2F%2Fwww.google.com&amp_tf=From%20%251%24s

Hi, hope you are doing great.
Yes, commerce students can apply for the NDA exam, but they are only eligible for the Army wing not Air Force and Navy.
The NDA exam has two papers:
Mathematics
General Ability test

Mathematics:

The paper is of 300 marks and has total of 120 questions. For Mathematics ,you can just rely on your class 10,11,12 books. There is  no need to seek any other books for it. Try to learn shortcuts and tricks for time management during exam.

General Ability:

This paper consists of two parts : English and General knowledge.
You should read a newspaper daily and should have knowledge of static GK topics . You can rely on Lucent GK for it. For English, prepare well and make your vocabulary rich and practice antonyms , synonyms, passive active voice etc . I.e. general English Grammar.
You can practice via mock tests and previous year examination papers.

Hope it helps.
Best Wishes

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