cshar
hii,
i just did the year 11 exam and honestly, it wasn't too hard, but it was definitely more reliant on your time management skills than knowing the content, as most of the questions were really easy (unless you do science reasoning or the science test which relied more on what you have learned over your years of studying). However, obviously, you can't always finish every question on a test, but the range in terms of your time management is 30 secs per question.
hope this helps!