For developer test you just need wsad. It has a full and very good integrated WAS test server.
If you have a fast internet connection, I would download a trial version of the newest wsad available. There were mayor improvements with the 5.1 releases, especially in Webservices and JavaServerFaces (I don't know later, but Webservices tools are way better now).
I would consider buy books by Kyle Brown (good and detailed introduction in Websphere development) and Howard Kushner (for certification).
For the UML certification you need Fowler, UML distilled and Larman, UML and
Pattern applied.
All those books are worth to have. I use them quite often for reference, even now I passed all those tests.
Axel