Which year are you trying to get in ?
My son took the Year 3 assessment. I heard that they will test the kids according to Year 4 standard though. He was required to do a writtern Math test, then a English writing test and then an English and oral test with a teacher. It took about an hour and the parents were supposed to leave the kid alone and come back after an hour time.
What do you want to know ? My son just joined the school in Year 3 last year, he's now in Year 4. If my experience is relevant to your questions, feel free to ask.