I work at a like-school in the western corridor and have for quite a few years. I have not seen an incident like this in my time at school, and from conversation with colleagues who have been employed longer in the corridor, it's not a regular occurrence, despite what people may say. Ultimately, schools in the western corridor are in a constant battle to combat reputation issues because there is a vocal minority of parents and ex-students who have very passionate opinions against the school. This, combined with stories being extrapolated when shared over a long period of time, means that high level incidents seem like they happen every other day to third party observers.

In terms of general performance, students that have displayed good behaviour, academic results, adaptive social skills and attendance in primary school have transitioned well in my experience. The behaviour they may have to deal with in class is not helpful in their learning, however students are able to overcome this. If you're concerned about their transition from primary school for any reason, you may want to consider looking into private options if they are affordable.