Avadhesh, according to the guidelines, you should have completed 17 years of age on or before 31 December 2020. Also you should have completed or should be completing your 12th boards in 2020 from any recognized board. You should have English, Physics, Chemistry and Biology as your subjects in the board exams and should have secured at least 55% marks (50% for SC/ ST students).

Since you fulfill all these criteria, you are eligible to do BSc Nursing in AIIMS. For more details you can visit: https://medicine.careers360.com/exams/aiims-nursing