This course is content-heavy but it is not difficult, and it is definitely interesting. The first few weeks are the most work. It's important to keep up with the assigned reading and make sure you understand the foundational concepts (e.g. mitosis and meiosis, DNA replication, etc).

READ THE TEXTBOOK. It goes into more detail then necessary (you don't need to know, for example, any biochemical mechanisms), but taking notes is a good idea. The exams test your understanding and problem-solving, so do lots of practice questions.