Actually I think the javaranch mock exam list is one of the most comprehensive (though the exams themselves may not be the all 1.5) list on the web. When I clicked on one of the older exams such as 1.4 and I encounter a question that I know should not be in 1.5 anymore, I'll just skip over it. Even skipping the older version questions (such as those on AWT), a lot of the mock exam questions are still useful for practicing.
Many of these sites in the list is well organized too, with separate page answers and detailed explanations. I find it very useful as assisting with more practice in addition to the K&B self
test and sample exam questions. Of course, if you buy the commercial mock exam kits they are probably more up-to-date, but this free list basically contains more than enough practice questions.
In fact I only use the K&B book and this mock exam list...