Not too easy. Not too difficult.
For the most part, the answers were correct. However, sometimes the answers would be wrong and the explanation of how the answer was figured out was vague and confusing to follow.
It helped me ace my homework, especially with the tougher questions. It helped on a repetitive basis and being able to see numerous examples of a certain problem worked out.
Hours per week:
Advice for students:
Repeat problems over and over so that you know which techniques to use for certain kinds of problems. But keep in mind that there are exceptions and weird rules that you can't learn by heart, so make sure to have a basic understanding of the fundamentals of a problem.