Twist of the Wrist 1 is a bit deep and hard to read anyway but;

Twist of the Wrist 2 is in fact the CSS level 1 and is far easier going.
Twist of the Wrist 1 is level 2 of the CSS and does make more sense after level 1.
Levels 3 and 4 are covered by The Soft Science of Roadracing Motorcycles.

The thing is with the CSS and the Code books you can't just dib in and get the odd hint, it's a system, a soft science, hence everyone starts at level one, if the basics of your riding don't agree with the Code way then nothing else can. Code says it's not about having the most nerve, seeing God then braking or any other cliché. Once you've got the bike behaving it's about knowing what you do, where you do it, where you are and where you're going, once you know those you can make changes to go quicker. Without it, well, how can you change (for instance) where you brake when all you know about where you brake is if it's any later you (think you?) will be in the gravel?
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Please do not PM me technical questions, if you can't find it on the Forum start a thread