SBK X: Superbike World Championship

Easiest way to do this is to make sure you turn off race penalties, and race on Monza.
This means you can cut all 3 of the chicanes without getting a penalty, which makes it MUCH easier to beat the AI on the "real" setting.

Go to Imola.

Race length to 5% (1 lap), sunny weather, race penalties definitely off, damage/etc off if you like. Starting position 1st. Set simulation to LOW so you can push it hard. Bike class is up to you.

Now just cut the chicanes. The first (turn 2, Traguardo) is right after you start. Make sure you're on the left (you'll be on the right if you start in 1st, move over ASAP) so you can avoid the AI riders braking for it, and just shoot across the grass, over the chicane, and across the sand on the other side.

Second chicane (turn 5, Villeneuve) is up ahead after that. You want to hit the grass but be turning right immediately after so you'll be pointing down the track after you come off the sand. Now go for it and race as fast as you can, you should have second or two lead on the pack.

The third chicane (11, Variante Alta) is the key. You want to only *just* cut it, as the grass there is very sticky and will take a lot of your speed off... be on the right of the track as you approach it, and turn hard left so you end up pointing right down the long straightaway. Be very careful of the low wall that will wreck you if you turn left too soon. Do it right and you'll have a huge lead that you can keep for the rest of the race.

Now just finish the race. And watch out - another of those walls awaits at the final two sharp bends so don't be tempted to cut too much there!