Hi Guys,
I don't want to disappoint you, but the exam was really tough, I passed this exam on last Feb. I have 8 months hands-on experience in deployment and administration and also covered about 80% of the topics in exam objectives and I passed with only 65%.
The exam really is about hands-on experience, anything you did with your own hands you will answer it easily, but topics you just have read about will not be easy to answer.
So, I don't say that the exam is impossible but I think 3 weeks if you don't have solid hands-on experience is a very tight period.
And to prepare for it I recommend the infocenter (and nothing else), most of the exam questions were like copy-paste paragraphs from the infocenter, try to cover the objectives from infocenter.
The sample test also was a good assessment for me, there was no questions from the sample test in the real one, but the difficulty level was very close.
Good Luck
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SCJP, SCWCD, IBM 397