No it is not as long as your preparation levels are good. The chapters are defined and generally not much things come out of syllabus. Just keep your concepts clear, you can make it :)
Nishant, AIIMS Ug is a little tougher as compared to other medical entrance exams.
However a consistent approach and focused mind can help.
You should focus on NCERT to build your concepts and solve lots of MCQs.
All the best.
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