Most students are not going to become highly successful at math with only 3 - 4.5 hours of classroom time. The key to success is repetition. Just like with sports or a musical instrument the more you practice the better you get. Students have to spend time with the math concepts they are learning. They have to watch the videos and do the practice. They should be reviewing their notes at home and maybe even rewriting them and adding to them. I tell my students all the time they have to take ownership and be responsible for their learning. I will do anything I can to help them, but they have to partner with me on this. Parents, I need your help, too. Please make sure they practice math every day. Whether it is Compass Odyssey homework or just watching a video on the concept they are learning, with repetition will come retention.
Here is a great video that explains repetition, retention and how to use Cornell Notes.
Please watch and take note.