I've assembled a binder with the review questions to make it easier to find and study them. There are about 50 questions in the review section for each module. I'm also keeping a notebook to store aggregated notes - a list of the oils and their primary chemical constituents and a list of the therapeutic actions of each of the main constituents. I'm also keeping track of some usage notes from my essential oil applications. Here's a sample of the chemical constituents notes:

Next week, I'm planning to attend an orientation for modules 4-5. We're going to study chemistry, botany, and begin preparations for conducting case studies. I still feel like a beginner, but I'm starting to grow familiar with the terminology and have begun watching the monthly webinar lectures. I've also been tinkering in Lab Aroma. I entered a few of the themed-blends that I've made and am exploring their components and chemical details :)
The course has been challenging so far, but also exciting. It feels great to be able to apply myself to this area of study. I love exploring different essential oils, plants, and applications. I hope that someday I'll be able to make aromatherapy blends to help others, too. One step at a time, but it's coming along!