The things that are available for free are not really usefull.
First of all these examples are too old ( staatsexamen nt2). http://www.expertisecentrumnt2.nl/staat/staat2008/
(You need a welltrained teacher to examine the results in a proper way)
Or they are too simple and incomplete ( inburgeringsexamen )http://www.inburgeren.nl/inburgeraar/ex ... xamens.asp
(the portfolio you need to work out with a teacher).
If you want to take the right decision you need a specialized teacher.
This will help you more and better than struggling on your own.