Don't sweat it. If there is an intrance exam study through one of several books for it. Or just buy the book for CNA. This and a little math is generally as much as you will need to know to get in. There are also books for that. If you are smart enough to do effective office work you will make it. Although haveing been an LPN, I really encourage you to go for your RN. You will do the same work as an LPN but you woun't get the respect or the money an RN does. Generally you can buy the same books at a bookstore off campus cheaper. Good luck.