Probably largest in numbers, but not in percentage. California is 14.4% Asian, while Hawaii is 37.5% Asian (and 23.0% two or more which includes significant numbers of Asian + other(s)).
However, the relatively recent immigration of Asian people to California has been highly skewed toward highly educated people (think of PhD student and skilled worker immigrants), compared to both their origin countries and non-immigrants in the US. So it is no surprise that their American kids do well academically, growing up in families with highly educated parents.