The only approved tool is the CRP computer so you will have to learn to use it like the rest of us.
You can then promptly forget how to use it like the rest of us......
Do your flight test in America in a Garmin 1000 or similar equipped aeroplane. They you can use full moving map GPS, full fuel planning, full weather, and yes, it'll even tell you when the engine has failed and the best glide speed. Oh and don't forget, leave your paper charts at home, you no longer need them, though I'm sure the examiner will expect you to be able to enter the route into the GPS flight plan, and expect you to be able to use the autopilot on your travels / diversion.
