Hello

The cutoff varies every year and is determined on the basis of various factors. Some of the determining factors are:

Total number of students appeared for the exam
Available state-level quota
Maximum marks scored by a Student
Lowest marks of a Student
Reservation criteria
The difficulty level of exam

You can go through the link below and check the previous year cutoff for reference and to have an idea about your chances of qualifying for next level:

https://school.careers360.com/articles/ntse-cutoff

Good Luck!