I am a Physics undergrad with 3 semesters left. I just finished my first QM course this past Spring and did very well and enjoyed the class greatly, but I find that information is already starting to slip away from my memory banks, as it were. It's so much to take in and to be honest, we only covered the first 4 chapters of our textbook (Griffiths). I know repetition is my best friend when it comes to retaining knowledge, but it is a bit daunting especially considering I want to continue on to grad school in a theoretical research field. I have this fear of getting accepted into a program and then making a fool of myself because I have forgotten so much. No real question here, just venting.