For important topics tested in NEET you can use the list of important topics given below:

https://medicine.careers360.com/articles/neet-chapter-wise-weightage-and-important-topics

For past papers, you can use the links below:

https://medicine.careers360.com/articles/neet-sample-paper

https://admission.aglasem.com/neet-question-papers/

https://mystudycart.com/aipmt-past-year-papers-free-download

https://www.examrace.com/NEET/NEET-Previous-Years-Papers/

Mainly focus on important topics and solve past papers, this will help you get a good score.

Good Luck!