Professional Mode:
From the beginning, choose Arcade Mode, then choose the Hard difficulty. Hold
L1+R1 until Hard changes to Professional.
Saving Money:
It's tempting to spend money on upgrading as soon as you can, but try to resit. Wait until
you get something with a bit of potental, as piling your hard-earned cash into a low-spec car
is generally a waste of money. Instead, practice being a better driver. Wait until
you win a car with some real potential before you upgrade. For example, start out with
a Mazda Miata, but do not upgrade. Use it to win a Mazda RX-7
Effini 3, then upgrade.