lovemymiata i can point you to sevearal videos of the nurb, with skilled drivers (no not me) at the wheel.
4 vids with 3rdgenracerX at the wheel, 3 of them are at the ring.
Rudi Rasier does a lap in a Arcade M3
so there is 4 vids in total of the ring, all which should help you. When learning the ring learn it in sections, dont worry about the whole track just learn it bit by bit. For me i learnt the start and end fairly easy but forgot the middle a lot (1st carusell - just before 2nd one). But after running it for fun a lot ive now pretty much memorized the whole track.
Also do the nurb license tests
A - 7 Cornering - Volkswagen Golf V GTI
A - 14 Cornering - Audi TT Coupe 1.8T Quattro
A - 16 Cornering - Mazda RX-7 spirit R Type A (FD)
IB - 2 Cornering - Mercedes Benz SL 500 (R129)
IA - 13 Cornering - BMW M5
They are normally crucial sections which can gain or loose a lot of time, especially A - 16. Gold them if you can but if you are unable to always watch the demo and you should be able to at least silver them
. When racing the nurb try to visualise, or at least know the next 2 - 3 corners so you are able to set your car up for them and be prepared, that way no corner is a suprise. Once you have learnt the track and are able to predict the next 3 turns or so from anywhere on the track then you go about refining your lines, and watchin the vids more closely.
I hope i helped you!