Jacob goes over material super fast. Each lecture is a new topic, and it is important to pay full attention and understand the previous content. To be honest, given the nature of Calculus III, he does not have an option to slow down the pace if he wants to cover every thing in one semester. While this class is fast-paced, Jacob is willing to help his students during his office hours. I do not find his exams to challenging, as long as you do and understand all the practice problems given by him. Take advantage of TA's office hour too and use outside sources (YouTube, Khan Academy, etc) to enhance your understanding.