Portlet development certification

[Vinoth Pu]

I m trying to take the IBM certified solution developer for Websphere Portal exam. I did some prep with Cameron Mckenzie's JSR-168 Portlet Development book. Any other materials i can refer to in preparation for that?

A while ago, the test number used to be

399, or then 829

Is the following the most current test for the above?

915: IBM WebSphere Portal 7.0 Solution Development

I am trying to take some mock exams. Are there any good and competitive ones to buy?

Thanks in Advance.