Anecdotally, it absolutely has. The people I knew growing up (regardless of race) whose parents encouraged educational excellence were far more likely to attain it.

(Looking at your link, it's important to note that it doesn't separate Jewish and non-Jewish Whites.)

But it looks at all students (not only those that make it into the Ivies), so Jewish whites, that are only ~4% of all whites, have a minuscule effect on white SAT scores. Yet, for non-Jewish whites, comparatively higher SAT scores have not translated into higher Ivy enrollment.

>Jewish whites, that are only ~4% of all whites, have a minuscule effect on white SAT scores

On average, yes. At the Ivy League level, though, they account for a solid third of the white admissions. I'm sure you'd find a similar overrepresentation in the top few percentiles of the SAT.

> I'm sure you'd find a similar overrepresentation in the top few percentiles of the SAT.

Even supposing this is true, it still doesn't answer the question: Since non-Jewish whites do better at the SAT than Blacks and Hispanics, why does this translate to lower, not higher, Ivy enrollment rates?

The data clearly shows: higher SAT scores help every group except non-Jewish whites.

I get the general point about the affirmative action, but it's important to remember that it's not just Whites getting the short end of the stick. Asians are absolutely underrepresented too.