Zandy is one twisty pretzel of a track. I have placed some curb markings on the picture above. There are a lot more curbs but the ones posted in this picture may give you trouble if you hit them. Some of them can lift the car pretty good so care must be taken. It seems to me that whoever designed this track strategically placed these higher curbs very close to an apex in many cases. Speaking of apexes, Zandvoort offers some very complex corners a few of them being double apex. Combine that with some high curbs and life gets interesting here. So the first tip is to have an eye for which curbs can be used and which ones to be cautious with.
The next tip will focus on a very fast series of corners that are not tight double apex corners but present a significant challenge. A successful entry and exit into and out of Turn 9 will set you up to maximize Turn 10 which will in turn, sets you up to maximize Turn 11. It is important to begin this whole series of corners at the acceleration point (apex) of Turn 9. The next screen shot shows you don't have to be afraid of the first part of the curbing at turn 9. It may be utilized if you wish and are comfortable doing it.
The next photo shows the apex (in red) and is where you want to be back on throttle as soon as possible.
Note the exit spiral of the cars in the picture above. Let the car roll out towards the curbing on the high side between corner 9 and 10. When you get it wrong you will know it right away. This next photo shows my line out of 9 is poor, I got it wrong and this is going to compromise my angle to Turn 10
You can see from the above my car (2 in front) is a good 1.5 car lengths to the right of everyone else. My entry into 9 was not like the first picture where the corner apex was maximized. This poor entry led to a poor exit which will force me into an early apex and the result will be a loss of a few 10's. The next shot is an overhead view of the same. If you draw an imaginary line from my car to the next curbing you can see I have to hit the corner early. If you do the same with the red car you can see he sets it up perfectly and will maximize his run to and from Turn 10.
Therefore the lead red car and the others following on the correct line are all going to enter turn 10 coming close to the apex and getting back on the throttle for a good exit. My car will be to tight and I will not be able to get back on throttle quick enough. If I do I will push out and risk and off track on exit.
There is another tip here that is worth mentioning. It can be useful to save a practice replay at any track and view it from either the blimp or helicopter view. Look at the photo's above and note the rubber on the track. This gives you a good idea of where you need to place your car in order to hit the apex. Using this tip have a look at Turn 11. It is a more complex corner and you have just exited Turn 10 with not a whole lot of time back on throttle before you enter this corner.
Looking at the rubber on the track can you figure out the best place to enter? Where is the apex? Is there more than one apex? What about the exit? Asking questions like this will force you to really think about entry, apex and exit. About threshold breaking, trail braking, rotating, rolling off throttle and back on throttle all the little micro skills that will help you drive at the limit. Utilize the ample practice sessions this league provides to hone your skills. Good luck at this difficult but fun track.