They have higher IQ than americans
That would make a difference on the average result, yes. Whereas differences in skill for the better among the very highest IQ individuals would be seen in White societies. White geniuses are seen in greater number in the world than geniuses from any other race. Someone such as, for example, Ironage German physicist Max Planck.
Jewish geniuses, while less numerous than White geniuses, are more common on a per-capita basis in the Jewish community than White geniuses are in the White community.
They are also more subservient to law and order and will follow guidelines.
Interesting point there, too - This may be related to the fact that the cognitive level of Asians is very close among different people within the bell curve in question [for the particular Asian ethnicity being studied within that particular study on IQ, you will find that the average IQ is very close foe all average people - not spread out from very dumb to very smart like it is for White people - at least, much more].