I found the following in a certain college handbook. I’ve read something like it before and I believe it’s based on some research work:
You remember approximately 10% of what you read, 2o% of what you hear, 30% of what you see, 50% of what you see and hear together, 70% of what you say, and 90% of what you do.
That’s why I insist that my students DO a lot of high-quality work because that IS the best way to prepare for exams. I also like to ask students to summarize or re-phrase their understanding of a concept and SAY it out. People who teach others are also continually reinforcing their knowledge, thus it is a good idea to share your knowledge with friends. 🙂
