FOR AIIMS preparation of physics from ncert is sufficient.

Definitely not.
But it is the most important book for aiims mbbs entrance exam as it contains the basic knowledge for every single topic.
Some people may crack exams with ncert only because they apply in their questions what they had read. But it is much easier to practice more and more questions from different books so that you became familiar with new questions.
In every exam there are certain questions which are out of the syllabus just to make students a little nervous. Toppers skip those questions to avoid negative marking.