To prepare for the PADI Divemaster course, ensure you meet the required certifications and health standards. You must be at least 18, have open water and advanced open water certifications, and complete CPR/first aid training. Being committed to safety, environmental protection, and helping others is crucial. To get ready, dive often to log necessary dives and improve your skills. Lastly, practice swim tests to build up your fitness level, as swimming is a key component of the training.