I didn't look at any of the practise material and I passed everything first time. I found it very easy.
Each round of tests started with an example question. This was enough to help me understand what to do.
Basically the tests are easy if your brain is wired the right way for them. One of the people in my assessment group couldn't grasp the dials whatsoever and he crashed and burned .. I thought they were the easiest bit.
I believe strategy is key. The dots test is about pace, your reading pace is probably the personal bench mark. The coordination test is about not playing catch up, or guessing. If you miss one focus on the now. The gauge reading is simply can you tell the time and work out scale.
The tests are not meant to be about familiarity, yet practice is key. Personally I think the tests are of limited merit. Occupational psychology has made improvements in safety no end, from the non-technical skills agenda.
A candidate fails the dots test so they can't concentrate. The candidate passes the test in six months time and now they can concentrate. Being conscientious is probably more important. Taking up references is a thing of the past.