Failed pn 1st try feeling useless

I took PN on Oct 18,2013 and failed.I have been depressed,and very upset since.I feel so dumb almost all my classmates passed are working and bragging about how big their checks are and Im still studying for this exam.I keep asking people for help and each person is suggesting a different book.I am broke so I cant afford another book and to take a review class is out the question.I dont know if I should just practice questions or go back to my school books and try to figure out what Im missing.Im scheduled to re test the week before Christmas now Im wondering if I should push the date back because if I fail again Im going to be upset again and I dont wont to ruin my son Christmas.PLEASE HELP IM SUFFERING