While any school will normally deliver riding improvement, however I find some of the Cal SBK School "Doctrine" to be untrue. Like the one that says, if you have the bike balanced on the throttle (ie;no engine breaking and no power input to the rear wheel) that at full lean a bike cannot lose traction. Get fucked it can't! Ask any half decent racer.
There were a few other things in that course which irked me too.
As far as a learning experience goes, one of the best schools I have seen, is also one of the most unassuming and relaxed days I have been a part of. That is the Preston Motorcycle Club's Bi-annual road race school. It is a combination of classroom and track experiences, as is the SBK school, but, it is delivered by current national A graders who really do know there shit and can fucking ride!
Last Cal SBK School I did, one instructor on his FIM 750cc SBK (an Ex PTR Bike) couldn't keep up with me to give me any tips. The next instructor, who was a mate of mine, had an R1, so he came out to help. He crashed on lap three trying to catch up to me!

I was only doing 1"46's, as I hadn't ridden on a track for 7 years?????
I want someone teaching me, who not only talks the talk, but walks the walk!!!

"I hate to advocate drugs, alcohol, violence or insanity to anyone, but they've always worked for me" Hunter S. Thompson.
There are really only two questions in life. 1.Which way do i go? 2.What is the lap record?