I've had that happen. It's like your eyes get directly connected to your hands and feet so you don't have to think about driving, you just react. Then you mind is free to do other things, have a conversation, space out, whatever, i end up thinking about work, bills, or my real car most the time. Then voila its 20 minutes later and you won the race. Its like half my brain becomes my b-spec driver... maybe i have multipule personalities??
To the original poster, I would sugest at least trying the S licenses first, don't even think about silver or gold; just try to get bronze. On the long courses they give some decent margins to get bronze.