I've still not finished everything but I began yesterday and it seems feasible.
The championship was a bit complicated. I saw that soft tires were allowed so I didn't even try with the hard one...
During my first attempt, I finished 4th at Silverstone, 7th at Trial Montain, 12th at Aprico Hill (stupid 2nd turn...), 3rd at Fuji and then 1st at Nurburgring. The problem was that I tend to make some mistakes and that the car is not very forggiving (I you go out of the track you lose a huge amount of time). Also, the car has a surprising behaviour in some long curves, sometimes you think it will be OK but the car is deported out of the track (while you think you already managed to pass some equivalent turns with an higher speed and without problem, strange...). It is probably because it does not have a fan included.
On 2nd attempt I managed to win the championship : 1st at Silverstone, 1st at Trial Montain, 5th at Aprico Hill (still did some mistakes...), 1st at Fuji and 1st at Nurburgring. Then I had to retry Aprico Hill many and many times before being able to win (in my last attempt, I managed to reach 1st place at the end of the first lap, I was really in the rythme). It is mainly a question of anticipation.
The Vettel challenge, I began with SPA to have an idea of the difficulty (Monza might not be representative). I was a bit disappointed to see that you can use shortcuts, but I avoid to cheat (but sometimes I take the advantage of not having my race ended by leaving the track, it's like you can take more risk because your errors are not always punished). I managed to get Silver and almost Gold after a few attempts (2'50"7) which I found surprising because my laps were not perfect at all. But still, after a lot of retry, I didn't manage to make it. It is all about getting a good pace without making error, but Vettel sometimes ruins your race since you have to take risks to overtake him, and then when you succeed to make it he hits you from behind (never saw a AI so stupid...).
I will retry today, I hope I will be more lucky....