CM&M is definately the worst topic.
I didn't pay any attention in class during that topic, not that we did much in class. I hadn't even started the topic until the day before our topic exam. I was rushing through the syllabus, skimming the text book in the afternoon, struggling with biological oxygen demand. Not a good way to study.
So that bad experience only contributed to my dislike of this stupid topic. I thought ozone depeletion was bad, but that was before I got to water management. Ugh. This topic is way too much like geography from year 10 for my liking. Give me acids any day.