I totally understand. It gets confusing. My one class, Ancient Greece, is a little like this.
-Read Chapters 5 and 6 (50-80 pages each)
-Read Part III (30 pages)
-By Friday night post minimum 250 word Discussion board question response along with citations and end notes
-Read supplemental material and watch videos
-By Wednesday night of following week (in the midst of next week's work), reply to professors comments on your discussion board question with a 200 word minimum and citations along with posting to a minimum of 4 other students' comments with at least 150 words with citations.
-Be working on short paper which is due in two weeks.
I'm scared about forgetting something, too. I'm trying to map it out on a calendar and post when I need to begin and not just the due date. If I focus on due date, I might not do it until the last minute.