AP 微積分：多項式微分

I am going to teach students differential calculus by solving math problems on a sample AP Calculus practice exam.

This one-time class will contain 30 mins of lecture time and then 15 mins of students' activities.
My teaching style is start with explanation of the math concepts involved.  Afterwards, I will show on the virtual white board how to actually solve some differentiation problems.  Finally, the students will be asked to solve some additional problems on their own, with my assistance.

The interaction will involve me asking them questions which they can reply verbally or write the answers on the white board.

They are  required to have mastered 10th grade Algebra 2 already.