1. No systems on the tech portion, just TMAAT and scenario questions.

2. I don't know what luminosity is, so I can't recommend or discourage its use. In my opinion there is no way to study for it. You have to keep a few things in mind with the COG test. It is a test that tests mutli tasking and memory.
1. Keep calm and answer questions as accurately and as quickly as possible
2. You will screw up
3. Keep Calm
4. Forget about the screw up
5. Calm down and keep answering questions and completing tasks

3. "Mental Math for Pilots", the performance and aerodynamics chapters of "Ace the Technical Pilot Interview". I did read a few chapters of 'Aerodynamics for Naval Aviators", but I don't think it really helped a whole lot as that book is much more in depth than what you need to know.

4. Study the Delta Gouge.