Depends upon you state in which you live in or have a domicile of.

The marks varies every year.

https://medicine.careers360.com/exams/neet

Follow the link above

The marks required varies every year depending on the level of the paper and performance of the students from your state. 

It varies from state to state, which depends on the number of medical colleges, number of students who wrote the exam etc.

If you could mention your state then a rough estimate can be extrapolated depending upon previos years trend.