I'm no expert but I will try to help
Brake just around the "apex" of that curvy bit before the karusell (Look on your right and you see the curb curve). As your braking and approaching the corner place the car on the right of the track, then turn and "drop" into the karusell aiming to go "under" it (all done on the brakes still). When done right your speed will carry you up the banking but fall just short of getting flung out. This allows you to brake quite late and keep the apex speed high, the trick is managing to slow the car down enough without continuing over the top.
I found that is a better entry than simply "following the banking smoothly" as It seems to allow faster entry as well as load the tyres for a higher apex speed. I suggest trying that F40 License test and experimenting with a few techniques to improve, as that license test is solely the karusell.
Once in the karusell, transition from brakes to around 50 - 60% throttle in 2nd gear. Keep the car on the banking without dropping to low (means your going to slow) or falling out (obviously too fast). Keep your speed as high as possible, avoid wild pumping at the gas as this will cause your speed too vary to much which will lose time compared to a nice consistent input.
When the exit is sighted floor it and change to 3rd as you pop out. The exit should be relatively smooth and not feel like you were "flung out" over the edge. If you come out too soon you will understeer pretty badly and even find yourself running over the grass on the right. You want to avoid any sense of understeer on exit as that kills your speed and run for the next straight.
Anyway Hopefully that helps
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If anybody actually found that helpful I would be willing to offer my 2 cents on other sections as well 👍