So, I'm scheduled to take this test next week. I've practiced and I'm ready. The software is flawed and this simulation does absolutely nothing to make me a better HERS Rater. All it does it make me more confused on how to enter different heating/cooling systems because this program is very particular on how you enter those systems. The program can be tricky and you can miss out on points by simply entering "N/A" instead of leaving something blank. I would have rather used the $350 to attend Rater Fest or something.