I haven't tried VA but the Base Certification Prep guides were awesome and provided value way beyond the certification itself. Unfortunately it doesn't seem like those kind of books are available for VA, probably because it's such a new exam.. So the User Guide / documentation is your fallback, plus the official SAS test questions!
See how to use one filter for multiple data sources by mapping your data from SAS’ Alexandria McCall.
Find more tutorials on the SAS Users YouTube channel.