The STAT test is either a MC or written exam or both, which is just a common sense question test some mathematical and some english type questions.
You can find out more if you go here
www.uac.edu.au find STAT test on there
The STAT test is used for people wanting to do Pharmacy at USYD not sure about other universities, you need at least a score of 151+ to get into Pharmacy. It is also used for other courses like VET science