Temporary Speed Sign: When flashing will require you do drop your speed to 60/70km in the 100km sign till you get around the corner to another 100km sign.
I had a student that failed last week on the way back for driving over the speed limit.
Also if there are trucks/buses on the highspeed roads keep a 4 seconds following distance. Specially uphill .
Drive to the road conditions
Driving Test Tips and Advice
Learn from what other have done wrong and try not to repeat them.