What are the disadvantages of late filling the NEET form
No disadvantage as such however if you fill post deadline you shall not be aloweed.
You must fillbefore 1st December 2018 as deadline with all fee payments and documentation as required.
All rulesshared below.
https://medicine.careers360.com/articles/neet-application-form
Most Scoring concepts for NEET
This ebook serves as a valuable study guide for NEET exams, specifically designed to assist students in light of recent changes and the removal of certain topics from the NEET exam.