Actually the Fremont High cachement area is considerably less Asian than that, and many of those Asians are Indian rather than East Asian, and there are a lot more Hispanics than in the immediate neighborhood, but your main point - that there are a lot of Asians in the school - is certainly still correct. I'm not sure if it's clear in the show that Bloody Mary and Liat are specifically Vietnamese (which is why they speak French, as Vietnam was a French colony in those days), as the now-obsolete term "Tonkinese" is used for them.