Overall OK, but I found some mistakes in the test questions.
Sterke punten \ Strenghts
A lot of content for a rather low price. The SAFARI BOOKS Online - as a part of the Blue Cable BASIC - are great
Verbeterpunten of tips / Improvements or suggestions
I found some mistakes in the test questions. This was corrected fast. But it took me a while to found out that the answer was wrong and not me.