LogFAQs > #883822333

It's too late now but whatever you get in 150cc transfers to 50cc and 100cc, so getting 3 stars in 150 Mushroom will automatically give you 3 stars in 50 Mushroom and 100 Mushroom. Mirror and 200cc don't do this, though.

If you do happen to do 200cc, remember to brake around turns. If you use auto accelerate, it might be a good idea to turn it off on certain tracks (most notably Rainbow Road). And don't trick off of ramps if a turn is coming up.