Continue to study after you think you have everything learned. You will usually not know the material as well as you think you do. Mentally rehearse the material at times you are not actively studying. See if you still remember it. Recite the material out loud as you study.
Mirrors are good places to practice in front of.
It is not necessary to teach an entire chapter. Practice refining your story telling skills. You may discover a talent that you never knew you had. Do not go to sleep while studying. You will retain more if you do not have an intervening activity between studying and sleeping.