That doesn't make sense. We are often required to read things that we have no interest in. Yet we are expected to comprehend what we read. There are always going to be classes, subjects, books that we have no interest in, yet if we go to a university, we are expected to perform regardless.
Exactly. You didn't always have an interest and unless you built a curiosity or had a "what's in it for me?" interest in the subject one would fail. If you aren't interested in the subject, you need to find one or you're not going to pass the class.
If you go to uni - you signed up for it. If you don't have an interest in it why sign up? It's tied up with your purpose.
The postviewing step is so that you can find what that which makes you curious and interested in the book. If it's not there you'll find reading harder no matter what system you want to apply.
There were parts of most subjects I have learned that I was not interested in, but I had to do it anyway because it was part of the subject I was interested in.
That is because of your purpose. You had an interest. Even if part wasn't interesting, you still had a investment of interest and curiosity.
Alex