The Ten-Day MBA
by Steven Silbiger
This book is basically what you would expect from trying to cram a 2-year program into 400 or so pages. It touches on a few important components of the MBA curriculum such as marketing, ethics, accounting, organisational behivour, finance, strategy, etc. but does not go into nearly enough detail for these to really be useful.
This may be a good starting point for learning which topics need to be researched further but ultimately, it does not feel like an efficient or useful way to study an unofficial MBA.