After not being able to get on GT3 for a few days, I finally got around to attempting to complete the Special License tests last night. I managed S2, S3, S5, and S7 within about half an hour; S2 was the one which gave me the most difficulty, but if you can brake and then accelerate out of the box corners with the proper timing, it's not too difficult (to bronze anyway).
S8 then became available to do, and I had remembered from here that this was the one which had given lots of people big problems. However, I was quite confident, being on a role since the last tests. I started the test and spun at the first corner. Then I did it again. And again. I then spent about 3 hours trying to get the damn thing done, but I was consistently screwing up the last sector. I could get T1 times of less than 24 seconds, T2 times of less than 1'08, but still finished in over 1'35. Then I remembered you guys saying to switch to manual gearing, and stay in third. I was a little wary, because in the past, me and manual gearing have not always got along. But anyway, I tried it, and in less than half a dozen attempts, I had got a time of 1'31.979. Cheers guys!