[Dimensio]

Are we allowed to conclude that Jews (as a class) are naturally smart? That they are smarter as a class than, say. Catholic Poles? Black Americans?

No. Why should cultural traits -- real or merely perceived -- be assumed to be purely genetic, or even genetic at all?

[RobbyS]

Performance on a standardized test and winning the "paper-chase" is as objective as a 100-yard dash. We observe that blacks run faster than whites.
We observe that a very high percentage of the Harvard faculty is Jewish. Ditto, the percentage of Asians at Stanford. Is this excellence genetic or behaviorial?
Every culture is the creation of a tribe.