Turbo Fire Class substitute?

Ok so my friend gave me turbo fire fire. It didn't come witg everything. So i just started it yesterday and the fire 55Class was def hard to keep up with. There was a couple of moves i didn't know. I have done her turbo jam in the past loved it abd kept up with no issue. However just parts of the fire 55 class was a tad bit difficult. Could i subsitute the class with another one? Has anyone done this with successful results? Any info is helpful. Thank you

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