But ma'am, I'm telling that currently I'm in class 11 (January)  & in April I'll be in class 12 (during April) so why I'm not eligible ma'am 

Hi Heitik,

No, you are not eligible to give NDA because one of the important criteria for appearing in NDA examination is that you should have passed class 12th examination.

Other eligibility criteria for NDA 2019 are as follows:

• A candidate must be a citizen of India or a subject of Nepal or Bhutan.
• Tibetan refugee who come over to India before 1st January 1962 with the intention of permanently settling in India.
• Person of Indian origin who has migrated from Burma, Pakistan, Sri Lanka and East African Countries of Kenya, Uganda, the United Republic of Tanzania, Zambia, Malawi, Zaire and Ethiopia or Vietnam with the intention of permanently settling in India.

• For NDA I, candidates must have born between 2nd July 2000 to 1st July 2003.
• For NDA II, candidates should have born between 2nd January 2001 to 1st July 2004.
• Gender & Marital Status:
  • Unmarried male candidates are eligible to apply for NDA.
  • Candidates must undertake not to marry until they finish their complete training.
  Qualification Criteria:
  • For Army Wing of NDA: Candidates should have qualified 10+2 or equivalent examination from any recognized board.
  • For Air Force & Naval of NDA and 10+2 Cadet Entry Scheme at the Indian Naval Academy: Candidates must have passed 10+2 or equivalent exam with physics and mathematics subjects.