Some people recommend physical exercise as a way to reduce stress. If you don't have time for this, see if squeezing something or pressing your hands against a wall works. I once met a theater director that recommended this.
i took the exam last weekend. but not cleared. this not to discorage u. but i suggest, if ur taking SCJP5. take some good mock exams.. if u get moare than 90%! then u go n take the Real one.. i paid 4 my risk .. i warn u .
if u r wel prepared.. ready to crack.. all the best.