I remember using the Mercedes GT3 car for this race.
1. I set TCS1
2. The first corner is where you can gain a lot, brake early, hit the apex, be very smooth on the way out, and you can carry massive speed into the straight
3. The 90* second corner is tricky. Go wide on the left, and cut across to hit the apex on the way out. Be gentle with the throttle, as you will spin off is you are too aggressive.
4. Next corner, brake early and anticipate the understeer. You have to balance the car with the throttle well here to get a good exit
5. The next corners are straight forward. Be smooth.
6. Last corner, is the same as the 1st corner. You can gain a lot here.
If i recall this race has rain too?