1) it's all depends on your judgement.
2) sit up straight, and adjust seat height and length.
3) when doing S-course, lean forward a bit towards the dashboard
so to see more clear to correct your viewing judgement.
4) just steer accordingly, in a slow speed in coordination of
hand and feet.
5) when near ending of it to turn out, steer away a bit from the
kerb and then steer back to do the turn to give the car a wider
berth to avoid mount kerb.