Guys I have just passed the SCJA with %90 and have studied around a week.
So I have shared my experiences on my blog :
http://dogangokhan.wordpress.com/2009/01/27/scja-certified/ You can find the "famous" UML file and a lot of tips there. Especially check out the
scja tips page which will definitely increase your score.
I am a Sun Certified Java Associate and posted a tips page on my blog. I think it is really important to write lots of codes, examine them and be careful about the details. For example, as all of you knows, "String x;" and "string x;" are not same. Every one knows it, but in the exam there are lots of small details similar to this one and you need to be very carefull.