ive raced the BF1 at AS nat and i was rubbish to start with. just follow this procedure, hit the brakes full on as you pass the shadow that crosses the road, keep full on until you start to hear the wheels skid, at that time start to lift off the brakes completely, this should give you enough speed to COAST into the apex and about half way to the exit point at which time you ease on the throttle.
downshift from 7th to 2nd whilst the car is straight. if you downshift during the corner you will lock the rear wheels and spin off.