To know about the important topics of NEET and their weightage-wise analysis you can refer below article-

http://www.medicine.careers360.com/articles/aipmt-2016-know-expected-cut-off-and-section-wise-analysis

You can also use below NEET prepmeter to check the weightage-wise analysis and your preparation level.

Click on the below link- www.medicine.careers360.com/prepmeter/neet-ug?icn=neetug-cp&ici=forum