Schools and even individual classes in a school can skew "smart", probably for some combination of chance and socio-economic circumstances. My (public) high sc

Schools and even individual classes in a school can skew "smart", probably for some combination of chance and socio-economic circumstances. My (public) high school class was commented on from grade school as being remarkably bright. But about 3/4 the bright kids were lazy as fuck and got terrible grades (myself included—and I don't mean the try-hard version of terrible grades like "oh no I got one b-", I mean Cs and Ds not being uncommon)—but then killed on standardized tests, 95+ percentile, very certainly not due to application of remarkable effort or even trying all that hard.