Just answer the 2 first questions on each page, and come back for the third one later on. Doing so you may be able to answer 2/3rd of the test, which is quite enough.
Although this method might work for some questions I do not fully agree.
On some pages (consisting of three questions), you need to do some groundwork to figure out what they are after. This initial work will help you solve all three questions on that page. Skipping the last question therefore will be inefficient time wise.
I have found that some pages have three very tricky questions requiring a lot of time. Rather skip this whole page and find something easier.
Other candidates with me said they tried starting at the back and it seemed more difficult that way.
Having said all this I still think we are probably making an mountain from an ant hill.
I personally finished 24 questions (some most probably wrong), other guys I know that got in only finished up to 17 / 18 questions.
So I dont think it carries that much weight.