I believe this is why there’s no benefit in cramming for entrance exams to get into a school.
My son is set to attend SPJ, and all of his friends also going there are sticking with their tutors, which makes us feel pressured to do the same. This time, they want to ensure they are well-prepared for the first impression (!) in September, then to ensure that the boys are on par with the very bright students entering at 11+ and 13+ in the coming years.
A mother I know, whose son is at SP (having started at SPJ) and has another boy at WUS, mentioned that the atmosphere felt more stressful at SPJ. Her perspective was that at WUS, everyone is focused on the internal 11+ exams, and most students pass, so it feels more like a community effort, although annoying, rather than competition. With new 11+ and 13+ entrants coming in, those already there don’t really question their abilities. However, at SPJ, the culture is more about the boys competing against each other without a clear standard like the 11+. So, it feels like an ongoing rivalry.
I think they are the same - 11+ or not.
That being said, I've heard differing views on the cultures of these schools. I think a lot depends on each boy's inherent abilities, parenting approaches, and how they originally gained admission to these schools.