Ive started working on my DM. Ive already turned some items in. I hope to be complete by this summer maybe a little later. I will watch this thread to get some good advice.
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This is the one that most people sweat about and for most it is the hardest test. Read chapter 4 in the Encyclopedia and then complete section 1 in the Workbook. Understand the gas laws and know how to use the formulas. When you have a question that starts at one depth and asks you to solve for another depth, always take it to the surface, then back down. Make notes for yourself, defining the gas laws and formulas in the simplest terms you understand so you can quickly review your notes right before the exam.