...even easier, you don't need to win, you'll get around 55k per 10mins.
- Go to Arcade mode
- choose Custom race
- choose Northern Isle Speedway
- then you take Mazda Roadster (N100)
- you make race to have 2 cars, set yourself to be second, pull all the options so you get more credits
- important is that you set to endurance and make it 10 minutes
- make an opponent to be Gr.1 and Professional level
- after that, just start the race
- for you, just drive up until start/finish, and not cross it, pull e-brake and go make coffee
- when Gr.1 AI finishes (10 min later), you just cross start/finish and viola, bling bling...
And if you wanna learn to drive good, set all to max credits, but put N300 Professional level, 20 cars with you at place 20, and take Alfa Romeo 4C (N200) on Dragons Trail racetrack... it is fun, you'll need about 5-6 laps to finish and it'll give you around 40k... if you win
Cheers...