Readmit nursing student :(

ive been in nursing school for two semesters. 12-13. didnt get to finish my med surg course. failing by a few points. im now up for readmit status, but wont be entering back into the program until january of 2014. I havent had any time to go back over anything since ive been preoccupied with work and my small child and husband. but ive been checking in with my instructors to see what i needed to revalidate on( which is pretty much all skills up until second semster) im really nervous about reaplying espically the math reverication. That was my weakest. however while i was in the program i was a outstanding student in clinical setting as well as testing. med surg just threw me for a loop. and the final hesi killed me. any advice on getting rid of my nervousness about readmitting. has anyone else faced these similar problems. also, how do you study for hesi's. im finding that thats my weakest spot. lecture exams i ace but hesi's i bomb every time! HELP. i really want to be a nurse. its all i can dream about but needless to say im discouraged.