Make your own study guide or test of questions while you watch the video.
Write down Why and How questions while you watch the video. Answer them for yourself or ask someone if you don't know the answer.
Make flashcards of important terms or problems.
Redo practice problems.
Use your notes from the instructional videos and apply the steps to the practice problems you complete
Take good notes! Stop the videos and rewatch as necessary to make sure you have everything written down legibly. If something doesn't make sense, ASK!
Organize your notes so they make sense to you!
Find a Youtube or Khan Academy video covering the topic.
Ask a friend in the same class as you to study together.