I found the Khan videos very helpful. My big problem with psych was memorizing a definition, but then trying to translate that definition into a real world example. For example in humanistic theory I put everything in terms of how I might interact with my patients and how patient-centered care would differ from treating them as non-normal. This leads thinking about a patient's self-esteem, self-efficacy... you see where this is going. Once I shifted my studying to learning real life examples of each concept, I retain the info much better and am scoring ~ 82% on my quizzes.