High On Life - I'm confused...there are no wet circle track tests in the IA (International A) license. I'm assuming you're referring to the A license?
Anyway, when I finished the A licenses, I thought wow those are pretty tough, especially the circle track ones. And guess what, there's more in the IB license tests!
Like the others have said, it takes practice. The Missing Link's guide does help. I was planning on referring to it alot to get the IA license figuring I'll shoot for gold and hopefully end up with at least bronze as I just wanted to pass. I ended up only referring to it maybe 3 times, but the advice of rapid tap, throttle control, and watching the demo from 1st person viewpoint with speedometer and accel/braking meters turned on really helped. I'm just glad I don't need gold to get the licenses but eventually I'll use that guide to unlock those cars. Just don't feel like doing it now.
One last thing I want to add...pay attention to the "gear suggestion" (the red flashing number as you approach a turn next to your gear in MT) Although sometimes you may get better results not using the gear that is suggested, it does at least act as a good guide as to when you need to downshift and the gear you should be in.