I have recently carried out the e-tray exercise for Deloitte (in January) and noticed that the example given in the wikiJob Deloitte profile may be out of date. I wouldnt worry though since it is really not that difficult and you are given all the information you need on the day. Most of the first part of the e-tray exercise is administrative stuff (for example: who should you assign to a task).
Its really REALLY worth checking out the e-tray exercise example provided on the civil service fast track website. This is very like the one in the test.
Also, I answered all the questions in the first part of the test just in time, or at least I though, one last question popped up when I clicked the last one about twenty seconds before the test ended so watch out for this! If you are dyslexic you can get 25% extra time in all your tests which could really make a difference.
The etray is a really achievable task, those who dont do well do so because they panic, be confident and self assured and that is the best advice I can give anyone!
Hope this (rather lengthy post) helps!