never took such exam, but searched these for you:
http://search.microsoft.com/results.aspx?form=MSHOME&mkt=en-US&setlang=en-US&q=VBA
http://msdn.microsoft.com/en-us/library/ms474284.aspx
http://msdn.microsoft.com/en-us/library/aa164019%28office.10%29.aspx
you could also check ref. books online here: http://books.google.com/books?q=VBA
good luck!