The Interne practice trees are fine to see how your mouse buttons are working, but I don't see any correlation to real experience. When you are there, you have adrenalin, some fear, no experience, a bunch of "flashing lights," a LOT of noise, some strange, random thoughts, and et cetera. You can use the practice trees to figure out your game plan, but then you have to take it with you to the strip, or the street, to practice and learn it so well that all the noise and stuff at the race track can be factored out. I think knowing how your vehicle responds to your control changes is the biggest part of working out your timing. I suppose somewhere there is a mobile application that uses GPS data to measure your actual reaction time, so you can practice without having to drive 50+ miles to a track.