Like you 5 weeks ago I got 57% at computeach, After 5 weeks of re reading, and going through Bill Brogdens exam cram guide (only because it was in the cheap book shop!), www.javaprepare.com
here at java ranch. Look at the areas that you were light see the score sheet given to you at computeach. They will probably ask you to submit an exam study plan. When they are happy they will authorise you to re take and then you clainm back the costs!!
I passed today not by much but still a pass, i hope that helps.