You could take the eLearning portions of TDI Nitrox, Advanced Nitrox and/or Decompression procedures, or just buy the workbooks. Those would give you a pretty solid understanding and practice on what I think you're looking for. If you decide to do that, shoot me a DM and I can get you a better price than what you'll pay to TDI.I have a related question: is there a workbook with sample problems to practice advanced dive planning (sport or deco). I have found some questions addressing one or other aspect of dive planning (optimal gas calculations, MOD, SAC, EAD, etc., etc.) but not hypothetical scenarios where various of those calculations are integrated.