It is very easy to get caught up in preparing for future classes that you may indeed forget about the mistakes you have made and make them again.
writing them down is a great idea… but you must study these mistakes and practice a better and correct way of presenting material.
what happens if you make that mistake again and again even after recognizing the mistake?
maybe a change in approach to how you present the material… try out your delivery with another instructor and get some feed back from someone who is not your student.