Good luck with that, I applied yesterday but still awaiting short listing. Out of interest can I ask how long you had to wait between submitting your application, and getting news of your assessment?
Best wishes,
Dave
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I'm no expert in this field, but a couple of bits of advice I can give you.
You will do some kind of fast reaction and coordination test, and there is a toy called bopit. If you can get your hands on one they are a good practice took, especially if you get a very high score and turn it upside down as well.
Also if you google "Group Bourdon tool" there is a practice tool for the concentration tests. You can download it to your laptop. I would recommend also printing some pages off and practice doing it on paper just in case they decide to use the paper method on the day. Once you have downloaded it you need to basically go through the pages and highlight the groups of 4 dots as fast and accurately is you can. You get marked down for any group of dots either omitted or incorrectly marked. Also you can do the SCAAT test using the same program which is similar to GB but involves highlighting certain shapes instead
Another idea is to go on-line and download some mechanical comprehension test questions. The "how to become" website has some good ones.
That's about all the advice I can give you at the moment, as Im still only at the application stage myself, but I wish you the very best of luck at your interview.