no.
1st prestige-1 class slot
3rd prestige-2 class slots
5th prestige-3 class slots
7th prestige-4 class slots
9th prestige-4 class slots
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Every time you prestige you get another custom class.
u have to beat all time trials and every level
This is the custom level is locked to unlock it to beat the gold time to get all the gold time from the beginners imerdiate advanced. All the levels I don't have custom.
You could always just pick a random class or make one yourself. Either way, it is possible to get every skill to 100 by using cheats or taking the time to level them. Go with the class you like best.
This is caused by custom content, mods or Time Machine in most cases. Deactivate Time Machine while playing, and try to remove your custom content...