Mech test is usually MT4.1 these days which is the harder one. 36 questions in 18 minutes. One question about circuits in here similar to the Barrons examples. Reading the Barrons book will give you the skills to answer about 5 questions on the mech test. The rest you can either guess or work out yourself. One question is about which way a tree will fall when chainsawed. Another shows 3 car tyres and asks which one is over inflated. One questions has 3 flag poles and asks which one is strongest. Other questions include pipes, chains, wheels, pivots, rivets, sliders, rack and gears, bell cranks, cams, levers, liquids, pulleys, joints and more. sometimes combinations of these. Difficult to prepare for as the Barrons book is not very comprehensive it has nothing on pipes and stuff just gears and cogs which is only a few questions worth in the Mech test MT4.1. There are other mech practice books and websites but none are of the standard for MT4.1 the Barrons book is the best of a bad bunch. But it's still nowhere near ideal - its a bit like using a GCSE revision book to prepare for an A Level exam.
Glop test is 18 questions in 7 minutes. Reading up on Sandite before sitting this test is the best way to prepare.
The Boredom test should be easy if you have practiced it. Reactions will be a bit harder but the downloadable practice tool helps a good deal