Hey NickyG, I'm in the same boat as you. I was offered a position on an ASP in early/mid March as well, and the lack of info in the email was slightly frustrating. However, it did say that once your position and itinerary has been confirmed you'll be emailed an "ASP Package", so fingers crossed there'll be some info in that. I also have some friends at East Sale at the moment and if I find out anything helpful I'll be sure to pass it on.
Tayra - thanks for those links. There's also a pretty good pdf floating around google somewhere (unfortunately I don't have the link anymore) which details all the pilot aptitude testing in use by the different branches of the US armed forces. There's some decent techniques in there about approaching typical battery testing, and it's good to skim through at the very least. I'll chuck the link up if I find it.