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.
Good Luck and hope it helps.