Patience and practice... Thats all there is to it.
Check out some videos on youtube, watch the lines and memorize the track, you can also learn about the 2-3 spots where you can actually cut the track a bit to your benefit. While going on the grass, remember to keep the throttle at the middle, thatll give you a bit of traction and youll continue to gain speed.
The difficult part for me was the 4th segment by itself (not on the complete lap). It took me several tries but I finally got it by 1-2 seconds. The key is to practice it. As a refeence, youll need to come out at the last corner before the long straight with more or less 1 minute left, otherwise you might as well just start again.
The whole lap is rather easy, youve got lots of time so dont worry if you have a minor mistake, just go with it...
Good luck!
