How old are you? If you havent raced at all, I would go in Nov B if I was you. The Nov A class is pretty quick and riding in the afternoon is not a good thing in mid July when it is 30c and humid.
As far as tires, there is no right answer. Go see Rob Lang and pick up a set of the new Michelins. He just had 3 skids of them dropped off this week.
Good luck!
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