Hello,

No topics are come from outside the NCERT. But if you see any uncommon question in NEET or any question other than NCERT books then it probably come from another Book but within your syllabus. Sometimes out off syllabus questions are coming then it will be given mark if you attempt them or no marking will be there so no negative marking also occur.

If you want to give all questions then you have to study so many Books for MCQ also. Not NCERT books. So many MCQ books available for NEET you can go through it.

All the best.