Dear aspirant

In neet most of the question are directly from the NCERT Book itself specially in biology so first you should be through with every lines of that chapter of ncert book. still if still you haven't gain the concept then  refer the standard book you are using for better understanding. Your knowledge /understanding should be strong for the topic then only you will be able to answer correctly.

Usually human health and disease gives minimum of 2-3 questions every year in neet paper. It's easy to learn also so you can capitalise this chapter for good marks.

Hope I was able to clear your doubt.

Thank you !!