The main hard classes for ADN would be A&P 1 and 2, microbiology, chemistry (if applicable), pharmacology (some school requires this before applying, other don't). Just to let you know...LPN school isn't an easy way out. They still have to prepare you to be competent in the nursing profession. Science, nursing, and medicine has more to do with how well a person can learn and understand the information. LPN students have just as much fear, sacrifice, and stress as other students. Find out what your end goal is and see what you need to do to obtain it. You still have to learn all the sciences in LPN school.