Hey Aspirant!

Every year 40k-50k students apply for kvpy and  around 3.3 k people got selected in KVPY written exam, and 2.9K got selected in the interview round. 

It's just a vague guess, because it all depends on the number of students that apply for this exam, and the ones who get scholarships. Also, their reservation criterias and their intelligence.

Best of luck!