Keep in mind, im not highly knowledgeable about this topic (im not even an economics student or whatever..).
Usually though, if its a bank, you have to pay the loan back starting pretty soon.
Even if its FEE-HELP, you have to start paying them back over a certain threshold: "Compulsory repayments are made when you lodge your tax return and your HELP repayment income is above the minimum threshold, $43,151 in 2009-10." So, even if you have a part time job and your making that much (who knows...) you still have to pay them back.
Below $44,912 Nil
$44,912-$50,028 4.0%
$50,029-$55,143 4.5%
$55,144-$58,041 5.0%
$58,042-$62,390 5.5%
$62,391-$67,570 6.0%
$67,571-$71,126 6.5%
$71,127-$78,273 7.0%
$78,274-$83,407 7.5%
$83,408 and above 8.0%
This is how much % of your income you have to pay them back.. yeah.
I personally dont think going a full fee place is a good idea but thats just me.
[I recommend emaling bond, i emailed monash medicine admissions and they were very helpful.]