Case in Point's only value is in understanding the industry and the market sizing question. I have yet to meet anyone who derived actual value from the framework segment, or who could reuse a single one of the ~15 he presents. After trying unsuccessfully, I eventually placed the book where it belonged (gathering dust on a shelf), and leveraged other material including the excellent LOMS. I also had access to multiple friends in MBB, but would objectively still have benefited from hiring a coach.

As for the case books - you dont need many, and even old ones are "good enough". The problematics are timeless anyway, so it wont make a difference whether the cases were drafted last century or yesterday.

As you go through your prep, make sure to seek actionable feedback (I emphasize the 'actionable' piece) and learn it by heart so you learn to use it and actually improve. Good luck!