Hello Aspirant,

It is quite hard to predict the exact shortlisting ratio because it keeps on changing depending upon various factors like difficulty level of paper, top score for this year and so on.

For your reference, NTSE Kerala expected cut-off for 2021 :-

So if you belongs to General category then you need at least 145-155 marks out of 200 in stage -1 to get qualified for stage 2 but still we have to wait because the cut-off mentioned above is only the expected cut-off.

Cut off depends upon various factors such as the difficulty level of stage 1 exam, Kerala State quota, number of students appeared in the stage 1 exam, last year's NTSE Kerala cutoff and so on.

You can also check out complete details about the expected cut-offs for NTSE Kerala 2021 from the link given below :-

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

I hope this information helps you.

Good Luck!!