It’s definitely competitive in terms of academic success in curved classes (such as microecon) and apps to certain clubs. But socially it’s not that competitive. No one really talks about their grades, and I’ve very rarely heard others brag about high school accomplishments. The people who are super competitive become known for being like that. The few I can think of are not very well liked.
Also, I think it’s good that you already have an accurate idea of Leo’s haha