Hey 

as I mention in all my answers important topics in NEET should be done properly & revised well because they fetch you marks in the exam . Relevance of a topic is how you decide what unif to pick up first 

solve lot of questions related to that unit to increase your speed & efficacy in exam . Improve your reading ability & dont stress too much

here is the link for percentage weightage of chapters in NEET 

https://www.google.co.in/amp/s/medicine.careers360.com/articles/neet-chapter-wise-weightage-and-important-topics/amp

Goodluck! Study well 

Hii

Here i am providing the link from which you can get the chapterwise weightage for NEET.
But remember do not leave any chapter, everything is important we never know from where does the question come up.
https://medicine.careers360.com/articles/neet-chapter-wise-weightage-and-important-topics

Thanks!