Hey Lalit.

The cut off to be selected for stage 2 of NTSE for UP  in the previous year was 131 marks out of 150. The cut off varies each year due to various factors like level of paper, competition. The maximum marks this year is also 200 unlike the previous years. Considering this you can expect the cut off in a similar range out of 200. You can use the link below to check previous year trends.

https://www.google.co.in/amp/s/school.careers360.com/articles/ntse-uttar-pradesh-cutoff/amp

Best of luck!