What am I missing?

Ok first off I used a gameshark to get the Gold Superlicense, and I still don't have all of the tracks available in arcade mode. I only have 1-10 available, also I noticed that I can "flip" the names of the tracks on the selection screen by pressing down on the d-pad, but the name stays the same and the track looks exactly the same, what is this feature for?

How do I get all of the tracks? I want to race on some of the ones I haven't tried yet.
 
Race the tracks in 1P arcade mode on Difficult. Once you win, you gain access to the reverse track. Now when you 'flip' the track by pressing down on the d-pad, you can race the reverse track.
 
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