I'm an old schooler - having taken the DAT back in 2002. I've resurfaced on sdn, and here's my advice on PAT and how it compared to my study aids...
Personally, all the threads that I've read about the PAT was that it was harder than the practice tests (back when I took it). I thought it was about the same, though the angles were a bit tougher, and there were some funky paper folding (not all the folds were 1/4 paper folds, some were in btwn, like at 1/8) cubes, keyhole, pattern, topleftright were about the same as topscore & kaplan & the registration matl.
i thought the topscore pacer worked well b/c it let me see which question i should be on. then it was just getting used to the speed.
- keyhole - i had a lot of trouble getting used to the keyholes until i realized that it usually was not as tricky as i made it out to be. conc. on curves and whether a corner is pointed or has a plateau at top and then just rotate it.
- topleftright - just practice and start to recognize that a curved or slant cutout can look just like a rect. most impt. just know how to rotate the obj from top to st8 to left. str8 to side view is you just take the right side (they give you options sometimes where it is the left side to trick you i guess)
- cube counting - i used the baron's mthd. write down # sides of cubes level by level, moving left to right, keeping track, then go back and answer.
hope this helps - I ended up with a 20 on the PAT (mostly luck, some skill, and lots of video game, heh, as Typo mentioned). Practice is really the key to improve your speed and to see how different shapes can be represented.
Cheers & GL.