I drew things out (muscles, neuroanatomy) or created color coded flow charts (krebs cycle, b12 metabolism etc.) on a white board, and then I erased and drew it from memory over and over until I got it right. I keep a notebook filled with the drawings so I can reference to make sure I am correct. Just depends on what you are learning. If it has a nice story to tell from beginning to end, this method of study is very efficient and helps you connect ideas. But if it is straight up memorization without a clear cut story, it gets a little tougher, unless it’s anatomy (for me the drawing helped me put structures in perspective, and helped me memorize). Flash cards work better for those. But again, it just depends on what you are learning.