For starters: Don't use your brakes on the circular tracks. Just release the gas once in a while if you see that you're going too wide.
For those licences, buy a car first, and go to Home > run & settings and take that track with the many many corners and sh**, try to do a lap without leaving the road, try cornering by releasing gas instead of breaking. I had the first 3 licences in less than an hour.
Greetz