Can the book "Turning Learning Right Side Up: Putting Education Back on Track" be understood without any prior reading?
Would almost everyone who got a high school diploma in Canada be able to understand that book.


We don't comment on specific books or specific individuals. But, there is an easy way to answer this yourself -- go to the Amazon page, click on "Look inside" and then "Surprise me!" Read a few random paragraphs and see if it makes sense. 


  even if they never took any more education after that or read any books they didn't have to read in school?...I want to read that book because I might think of useful ideas for the world based on it


I don't mean to be condescending, but reading one book will not make you an authority who can develop "useful ideas for the world," even granted that you are smart and have some relevant life experience. There are education professors who have spent their lives thinking about how to improve the educational system, and even they rarely see their ideas accepted and implemented.