It was The New Yorker.

"He was a C student at Phillips Andover. He got a not-so-stellar 1206 on his SATs - 566 verbal, 640 math. That was a full 180 points below the median score for the Yale University class of '68."

"...And in the years that followed, young W never pulled his average above a C. His college transcript, in an eye-popping leak to The New Yorker magazine, showed a 73 in Introduction to the American Political System and a 71 in Introduction to International Relations, to cite two examples that could mean something in hindsight."

Heres the source article that these quotes came from.
I make no claims about this source.

Z~