Yeah! For AIIMS BSc(H) Nursing you have to do both the 11 and 12 as a syllabus of the examination.
For eligibility criteria of AIIMS BSc(H) in Nursing and many other details you can visit the link provided below:
https://medicine.careers360.com/articles/aiims-nursing
I hope this answer helps. All the very best for your future endeavors!
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