Hello

Your score seems fair enough to qualify the exam but selection for the second stage of NTSE 2019 depends on NTSE WestBengal Cutoff. The cutoff will be released along with the result. 
Also, this year cutoff is expected to show much change due to change in the exam pattern. 

You can go through the previous year cutoff for reference

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

Good Luck!