To fix any and all repairable parts while they are still on the car without having to take them off, press [Delete] + [End] + [Page Down].

When you are in job mode, press [Insert] + [Home] + [Page Up]. The job will automatically finish, you get to keep your money, will get paid.

This does not work on high priced or third party cars. Buy an old or new junker from the auction. Do not repair this car. Just take and buy a new car door from the catalog. Put the door or whatever part on the car and auction it. This will generally make anywhere from $78 to $1,000 profit.

Do all the jobs you can. After it says that there are no more jobs, get a cheap car from the auction, fix it up, and try to get more than $20,000, which will get you to God-like mode.