I refer back to the interview with the UC Irvine professor, Richard Haier in the testing thread at #1485 Stanford, Harvard, Dartmouth, Yale, Brown, CalTech, and UT-Austin to Require Standardized Testing for Admissions - #1530 by Canuckdad. At least he posits that the G load has been reduced in the newer tests and that studies on the older tests showed limited improvement while the newer tests showed improvement with coaching @ the 6 minute mark.
I was a Kaplan tutor during college to pick up weekend beer and pizza money. It was not easy to tutor certain parts of the SAT that required a level of intuition like the analogies and the more complicated word/math problems. It was easier for me to help my kids prepare as the questions seemed to be more straightforward with repetition and recognizing patterns being very useful.