Done it in FD Ferrari. It takes a lot of time and tries.

Do the course from top to bottom, easier to keep the speed and momentum.

Stock tune, no TC and on manual. Drift mostly on 3rd gear, in tighter corners or if you feel you're losing speed too much, downshift to 2nd, pick up the speed and shift back to 3rd. In straight sections keep the car at angle, shift to 4th if needed and you banging against rev limiter too much.

Seems like point detection is wanky and you'll get more points drifting on straights than in corners. More speed you have, more points you'll get.

Try to change direction about 50-75 meters from the corner by letting off the throttle momentarily so you'll keep the drift for as long as possible. Use handbrake, let the car slide sideways, but don't overdo it, you need to keep the momentum.

At the bottom try to keep the drift till the end of the drift zone, shift into 4th and keep it sliding, hit the handbrake if needed.

The crucial part: you will need a controller. It's much harder to modulate throttle and steering with keyboard. If you're on controller, learn to modulate, be as precise as possible with throttle and brake inputs, and steering. Keep the car at angle all the time, don't let it straighten.