Fictional cowboy characters are often given nicknames which include place names. Sam's nickname just happens to have the name "Yosemite" -- it was as good as any other place.
if your really loving being a school mascot then i would eventually say that when everyone is cheering make the crowd go wild like always be confident and you never know it'll just boost your skills...
Both are correct but can indicate separate things: "at school" would be anything that took place within the physical area of the school, whether it was in class or out of class: "They met at school."...
It depends on the context.For instance you could say I am happy going to the school I currently attendOr you could sayI am most happy when I am going to schoolIt all depends on contextHope that helps...