Interesting you mentioned praccy aptitude tests. There is a book floating round that a friend used to do a specialisation transfer with. Used it to get faster and more accurate at maths q's. Said it worked really well, and you can pick it up from your local ABC shop ?? Said she nailed the tests cos of it.
Other hints? Always be honest. With the psych especially, as they will ask you two q's that are the same but worded differently, but they ask them 30 mins apart to see whether you are being honest or making it up. I had a 2 hr 30 min psych interview the first time and i think i got one question asked 4 times!! Who knows with the psychs, my brain was quite frazzled by then <img src="wink.gif" border="0">
Other tip for testing: If you make a mistake, don't dwell on it. Move on and forget about it (don't let it consume your focus for the ensuing tests).
Cheers,
Coug