Jim Plush's Programming Paradise

I just passed the 2nd test over the weekend for the MySQL developer certification. It was definitely harder than the Zend Certified developer test. There is no way I could have passed without some serious studying. The test covered tons of topics such as Client/Server Concepts, Joins,The mysql Client Program,,Subqueries,Connectors ,Views,Data Types ,Importing and Exporting Data,Identifiers,User Variables,Databases,Prepared Statements,Tables and Indexes,Stored Routines,Querying for Data,Triggers,SQL expressions,Obtaining Database Metadata,Updating Data,Debugging MySQL Applications,Basic Optimizations.

It's a two part, 70 questions per part test. I would definitely suggest getting the study guide as well as reading the online manual.