Read the book first - don't study just from the confuser. The questions in the exam are a bit different and you should understand why answer B is the right one.
The books - apart from Air Law - are really interesting and they are a good read. They provide you with all the knowledge you will need for your PPL exams.
I usually read a chapter, make notes, run through notes and then move to the next chapter, once i finish the book, i run through all the notes i made and if I don't understand something fully, I go back to it and read through the certain chapter in the book again.
Once I think I have it all in my head, i do the confuser questions quite a few times. If i get something wrong - I read the explanation and on a seperate sheet of paper i write the question number down.. as with every other wrong answer.
Confuser is useful, really useful but it shouldn't be used as a primary source of information for your PPL exams.
Study for PPL exams hard.. ATPL comes next.