For the basic compass test (ab initio candidates), the technical test is actually a physics test. The level is high school level physics. Everyone gets slightly different questions, so there is probably a memory bank of questions which the computer randomly selects each time. There's about 10-15 questions from memory. e.g they give you a picture of several cog wheels and asks which one spins the quickest.
In the advanced compass test (advanced entry candidates), the technical test is more aviation related.
The hand eye coordination section is also different between the 2 tests. Advanced compass does a ILS type test where as the basic compass test has a slalom course and a pitch and rudder control type test.
Maths test is not overly hard, but requires good speed at calculations to finish. If you can do long divisions, additions, fraction, speed/distance etc relatively quickly, you should be fine.
Memory test is about remembering some numbers and then retyping them for the computer. Its things like radio frequency, altitude, heading and speed.
Orientation test, the computer will explain how to complete this task, and then based on reading the instructions CAREFULLY, apply your new knowledge to work out which is the correct answer. There will be an artificial horizon and ADF/RMI type indicator, and all you have to do is based on what these instruments are showing determine which aircraft matches the displays. There will be several aircrafts displayed obviously. You try and get through as many as possible in the time given. But please read the instructions carefully, if you don't understand how it works, you will get them all wrong.