Not a full solution, but for anyone who found the drift zone's seemingly impossible (like me - couldn't drift to save my life!) here's what I'd suggest if you have the formula drift cars. I know some people might argue about these settings but it's What I found worked best for me :)
Car - 2006 Formula Drift #43 Dodge Viper SRT10
Tune - Drift Zone by Tiptronik ( Car class : S2 982 )
I had the following settings:
Braking - ABS On
Steering - Simulation
Traction Control - Off
Stability Control - Off
Shifting - Automatic ( I only turned this off for the last one I had to do which was S-Bend, although I'd now reccomend to turn it to manual for other zones as well if you're having difficulty)
Driving Line - Braking Only
Damage & Tyre Wear - Simulation (This can actually help a little on some once tyre's get a bit worn!)
Rewind - On
Feather the accelerator! I found this was so important when in a great slide to keep it going. You'll end up getting a bit of a feel for it however, and there are times when (especially in manual shifting) you can just hold it down.
If using manual shifting ( which really helps with not making the car go too fast ) I'd set it into 2nd gear and leave it there perminantly.
Don't try to use the handbrake, you're more likely to spin out or slow down too much, if you need to brake just tap the normal brakes.
Some of the drift zones it seems easier to attain the score if you've entered it from a certain direction, keep trying and see if there's one where you're score is consistantly higher - however I'd keep driving back through each way as you never know when you'll get lucky with a great slide!
Using rewind can be great if you spin off or do something terrible - however beware it can be very hard to control the car when resuming play, so constantly relying on rewind isn't great and you can end up scoring much less.
Some of the drift zones seem almost impossible to get the target score, but keep trying you'll get there eventually :)