If they interview even twice a week (they do it more frequently than that), they have had far more interviews than the number of accepted students would indicate if everyone got in. Average 15 students for each session (there are usually 20 in the beginning months). 225 students would fill up in 15 sessions if everyone were taken. That's not even 2 months.
I doubt everyone gets in. Maybe they do but people take other spots elsewhere. So that leaves empty spots to be filled. In either direction nova only seems to pick people to interview that they would like to have attend. Unless you start stripping and cursing mid interview I really don't see you getting rejected. But then again the numbers above don't seem to support that.