Im 20 i havent raced since about 2007 i rode B with pretty good results my first race on a big bike was about 2005 after i bought brian gerths 250f,i raced c class my first race on a big bike and finished 3rd the next weekend i moved up to B, and becuase u have to want it to win it ,i got faster. just trying to match pace when your behind someone teaches you alot on how to save time and better lines. i havent raced in like 3 years but i wouldnt go down to C i would practice and practice ..becuase when it comes down to it i dont want to race till i can compeat and i dont wana compete unless there is competition.