u/Dangerous_Ad_7104

If you have the power pack you can do a ton of credits by using the Aventador on the attached race. When those three yellow dots are empty, do this 3 times.
Skip both practice and qualifiers. You should be fine even if you are very conservative with your braking. Once you’ve done this 3 times the rewards will vary. I got 300,000 and a 6 star car roulette all together. It resets every once in a while, and you can repeat the process.