Our biology teacher told us to not bring the text book. He wrote and drew everything on the blackboard, and we had to copy it by writing it down. Never had to

Our biology teacher told us to not bring the text book. He wrote and drew everything on the blackboard, and we had to copy it by writing it down. Never had to learn anythings, and I still remember 90% of it, even visually. Remember that the great ones wrote a lot.