Achiever is way too easy, i was getting between 22-25 on achiever RC and i ended up with an 18 (i got piano). For Angles there was a post with some sort of laptop and hill methods or something. Ill see if i can find it.
I didnt use topscore, but check out orgodox's breakdown of his DAT, he broke it down very well. From what i hear Topscore is also easier than the actual DAT in rergards to RC.