I don't believe in any racing school anywhere in this world or other world. Especially, one day or three days course or even a week long racing school. How good of racing driver you can be in that short period of time anyway. Even if you can be good.....the best you can be is only to be as good as the one who teach you. And who is that guy? Is he the seven times world champion?...What did he drive?....Will you drive the same damn thing?....most likely the answer would be...NO....so...why waste your money.
Just go to the track....rent the track and drive. Get together with friends...find the one who know how...and drive. Try all the competition driving theories you always read in the book or internet, and see what work and what not. These day, there are plenty of Club and Group that organize a track day for any wanna-be racing driver that you can clock your lap time and get the real feeling(more or less) of racing.