I try to set the car to turn in aggressively (but not too
aggressively) while coasting into the corner. Then, I try to find the earliest point in the corner where I can get back on the gas. I've never learned how to use brakes in on-road, and I kind of doubt that's the fast way to go, since everything in on-road happens so fast that the slightest dab on the brakes scrubs more cornering speed than you need to get through the corner.
The old racing maxim of "slow in, fast out" seems to apply well to these little toy cars that we race for bowling trophies.