IPAS
I don't mean to reign in on your parade but may I just remind you that the IPAS test does not in any way constitute the "real" test they use. The IPAS is to gauge a general level of aptitude without pushing one to the limits. It's just there as a quick mock up to familiarise people with which aspects of their aptitude they will be tested on.
Please do not deceive yourselves into thinking that a good score on IPAS will lead to a good score in the actual test. I'm afraid that it is much more than that.
What adds more pressure during these tests is that they will all be timed and you have to get better than average scores to get through as they only want the "creme de la creme".