I used the memory supercharger every day this week right when I got home from school before reviewing for exams. I was able to remember everything on my science test and alot from my american government from reviewing for about 30 minutes. Its amazing how easy you remember stuff when you listen to these. I recommend listening to the Personal Genius CD before study or work sessions and listening to the Memory Supercharger afterwards to store the information properly and retrieve it effectively from your brain's memory banks. The combination of Personal Genius and Memory Supercharger will increase concentration, retention, and recall in all your studies. And dont worry, they wont fail you.