I got four of these done earlier this morning (normal difficulty).
Lago Maggiore - Mercedes S Barker Tourer '29 - I'm not sure what I was expecting, but the car drove pretty much like any other ordinary car. I didn't make any modifications to it. Took the lead in the final corner. Fun race. First ticket obtained.
Alsace Village - Porsche 911 Carrera RS (964) '92 - It's been a while since I've driven this track, so it took a few laps to refresh my memory and get used to the car. The only modifications to the car were SS tires and some aero. I was able to take the lead in the final lap. Good fun. Second check mark checked.
Monza - Mitsubishi Lancer Evolution III GSR '95 - I made an initial attempt at this with only a tire upgrade (SS). It wasn't going to work. At the end of the second lap, I was still fighting over P11. I bailed and went to the tuning shop for all the sport-level mods. That gave the car just enough umph to make the race competitive. I took the lead in the final corner. Good times. Second ticket obtained.
Bathurst - Garage RCR Civic - Even after upgrading the tires to SS, the car was well below the suggested PP of 700, so I wasn't expecting a win here, but I was still hopeful for a top-3 finish. The car was pretty good going up and along the mountain, but no so great on the long straight back down, where it was topping out at 245km/h in fifth gear. It could really use a sixth gear. As far as the race goes, I was pretty easily able to climb my way to P2. The lead stayed way out reach. I finished 10 seconds behind Serrano, and 37 seconds ahead of P3. Good enough for the fourth check mark, though.
Now all that's left is the DTM race. Looking forward to it.