Learn Java Online, from beginners through to SCWCD

I have been working on a new SCWCD exam containing 70 questions that closely match the published objectives of the 1.4 version (current) exam. At the moment this requires a password to access it. I will give the password to anyone who can come up with a correction/improvement/bug fix useful clarification to any of the other material. I am particularly interested in feedback on the mock exam questions as I am sure there are remaining unwanted quirks.

I have added substantial amounts of new content to the Welcome to Java course recently, there is around about 25% more text. I am very interested in comments and feedback.
Marcus