What is your origin or descent?
You may choose as many as three answers in the order with which you identify with them most. For example an Irish-Italian might identify most with the Irish and second most with the Italian.
Here are median (mean) ASVAB Math/Verbal score percentiles for various (first listed) origin groups:
Russian 83.625 (72.724)
British 77.916 (71.252)
Danish 75.19 (61.958)
Polish 72.194 (67.316)
Swedish 71.638 (63.886)
Scottish 71.083 (63.875)
Welsh 71.068 (65.105)
Dutch 68.623 (64.306)
Irish 67.978 (62.7)
Norwegian 67.864 (64.519)
German 65.08 (61.711)
French 62.016 (58.34)
Italian 59.912 (57.836)
Greek 56.368 (52.965)
Portuguese 51.088 (57.063)
Cuban 35.621 (39.861)
Mexican-American 30.107 (36.019)
Black 26.696 (32.532)
Mexican 24.822 (30.5)
[Note: I've limited the sample to respondents identified as non-Hispanic and "White", apart from the last four groups listed.]
I assume most of the "Russians" and a substantial fraction of the "Polish" are Jews. I plan to do more analysis of this data in the next week or two. NLSY97 contains much more background information, including questions about religion, as well as parent interviews which contain questions about the parents' ancestry and religion. Other test scores are included, as well.
Data on which of four census regions (Northeast, North Central, South, and West) the respondent lives in are also available. The single most intelligent region-ethnicity group seems to be British-identified Northeasterners, whose median ASVAB percentile is 91.543 (n=23). Next highest is "Russians" in the North Central region, at 89.556 (n of only 7).
The overall trend appears consistent with patterns of achievement in America identified by Nationiel Weyl in the mid-1980s.
The most basic trend is that the people of primarily Germanic stock (Germans, Scandinavians, Dutch, British and Irish) tend to outperform the Latins, the Slavs, and, to a lesser extent, the Hungarians. Considering the seven core indices as a whole, these Germanic peoples are clustered together with performance coefficients ranging from 90 to 117. The French, Italians, and Slavs range in the 60s, or at one-half to two-thirds the Germanic level.
[. . .] When we consider the differences within the Germanic majority stocks, several interesting profiles emerge. Among the Scandinavians, the Swedes are generally, though not always, in the leadership and Norwegians rank below the other two groups in achievement.
[Nathaniel Weyl. The Geography of American Achievement. pp. 23-24]