A few years ago, we were told 600 apps, 500 thru to second test, 200 thru to interview. There is no official data on this, only the school knows and they don't publish this data, it's all anecdotal. I can tell you that when I picked DD up from second test, there were clearly hundreds of girls there. The school has over 700 students, they can easily give 500 entrance exams given their capacity.
Good luck everyone.