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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