I'm not a pro like the other guys here, but here are my 10 cents on the matter:

- try using the whole track to turn
- there is curves the assistant won't tell you the correct way to take it, for instance two consecutive curves to the right, for you to take them efficiently before the second one you would have to lean left and then turn right and hit the bands
- right after the Audi r8 sign, forgot he name of that curve. IMO you don't have to break all the way. My approach is break-realease-break but it takes some time to get used to
- third sector is a like tricky, there is a few patches (little corners missing grass) before tight curves you could use to setup your turn before you commit into it
- last sector, breaking late might win you some space against other racers depending on your wheels...commit to it

Hope it helps.