Hello, just want to tell you that i've done all the three tests for the IBM Certified Solution Developer role now :-) .
The 157 was more difficult than i thought. The ICE test is nice, but no comparison to the real one. If for example there is an objective about the web.xml think about EVERY configuration that is possible there. I prepared myself one INTENSIVE week for that test, did an eLearning class three month before, but haven't work with the tool on a project yet (there are still some VAJ projects...). I think the best way to prepare for that (not to underestimate) test is to work with it within a project. I studied the WSAD Programming Guide and the Self-Study guide for WSAD. Best luck with your certification efforts. Next certification is the Enterprise Developer for me, but as personal business commitment in the next year... .