Well done on getting through the tests mate. Have a look at the FSP schedule for this year and next before you feel down on your luck. It depends on when you will get the call from PSA for two reasons. A) How good of an applicant you are and B) when PSA receives your file and what courses they have running. You could be the best DE applicant - they won't be putting you on FSP until a DE course is being run.
Without taking your application into account, if PSA only received your file in September, the DE FSP courses for October were probably already filled. The courses in November and December are all ADFA, they shut down over Christmas. The first FSP for DE is middle of Jan '10, they won't start filling that for a while yet. From there they run all the way through to the end of May - so you may not hear anything until March or so next year.
In terms of your other tests - the results will expire if you change job preferences or withdraw your application and then reapply again in the future. Best to check with recruiting though, but one hundred percent positive on it - if you have passed all the tests to date, you will not have to do them while your file is at PSA. Even after you've been to FSP and waiting in a selection pool, all your test results are still valid and will not expire.
It is a waiting game my friend, patience is a virtue.