Visualizing Derivitives

I love this site so far. I have only been using it for about an hour for the first time today. I am struggling with going from the original graph to the first dervivative for AP Calculus AB I was wondering if maybe you guys could add more practice problems to that section seeing as I keep getting the same ones over and over. I feel as though this is not very beneficial to me, seeing as it is quite repetitive. Thank you!