Select Dream mode, and start a new game. Enter "WORLD" as a brand name to unlock all courses in arcade mode.
Select Dream mode, and start a new game. Enter "DREAMY" as a brand name to unlock all concept cars in arcade mode.
Select Dream mode, and start a new game. Enter "REALITY" as a brand name to unlock all production cars in arcade mode.
After a race starts on the easiest level, get yourself into second place. Then, do anything to block the rest of the field behind you until the leader gets a very big lead. Catching up to him will be easy for you, but the rest of the field will continue to lag behind. You should be able to get a win, but you have a guaranteed second place if not.
The easiest way to get research points is to do the champion track races repeatedly. They are the fastest way to win research points.
Keep track of your factory between your races. If production gets too slow or your workers are idle with their hands in their pockets, you need to get some wins. If you are having trouble in your current class, drop down to a lower racing class to win easier and restore production levels.
The best cars to make are (in order), a roadster then one of each car after that.
If you are having trouble with a saved game, try the following procedure. Note: It requires a memory card. Go to the Xbox dashboard (open the tray) and copy your Apex saved game files to the memory card (savegame and setup). Delete the files on the Xbox. Reboot the Xbox without a disc. Copy the files back to the Xbox. The game should now work as expected.