Not done the Gowling one, just the
NRF one and a couple other non-law ones in the past.
I would try and make sure you're in a really calm and relaxed environment (difficult with a test, I know!) and really get focussed, especially for the middle two games. These tests are geared towards directly testing your soft skills and the
NRF one, from what I understood about the test, in order of games, tested your pattern recognition/problem-solving, attention to detail/focus/ability to perform under pressure (both games in the middle test this in similar but different ways), and emotional intelligence on the basis of recognition of facial cues (I honestly think this one is quite bs but you can find ways of "practising" by looking up facial expressions for different emotions).
Hope this helps, I've never used any practice tests for these so can't recommend any of those, I'm afraid.