The first piece. : it is your own knowledge reserve. Including the outline of the college entrance examination textbook, the grasp of key and difficult knowledge points and the familiarity with the textbook.
The second is to constantly hone their own courses, how to speak clearly, simply and effectively.
Third, to prepare students, we should know their overall mathematical literacy, as well as regular feedback and optimization.
I wish you a smooth teaching and limited ability, and can only provide some superficial views.