[gus]

Usually IC will not cover the subject at a 100% level, instead it will usually have enough information to pass comfortably. Many of the points mentioned in the feedback may not actually be in the IC material, but can be easily googled out .

If I wanted to finish a subject quickly I'd always use the 80/20 rule. Check out the exam's official study guide for distribution of content. If a subject makes up 30% on the exam, I'd naturally want to focus on it. That worked pretty well for me on some of the CLEPs, I wouldn't even have to go through the whole material (Educational Psychology for example), while other exams needed more thorough studying, supplementing IC with internet research and sometimes a textbook.

I wouldn't worry about IC not covering the whole breadth. Ultimately, it'll depend on what your aim is: high scores or a quick pass. I've mentioned this in past, the exam feedback section has very good advice, it's too bad it wasn't available when I started out. It's a very good starting point and very helpful in determining what you're up against.