"ฝันร้ายเตรียมวิดวะ" delves into the most dreaded subjects for aspiring engineers. Prepare to confront the titans of terror: the intricate and unforgiving world of เคมี (Chemistry), where molecular bonds and reactions can feel like an insurmountable puzzle, and the robust yet demanding realm of กลศาสตร์ (Mechanics), testing your grasp of forces, motion, and the very fabric of physical systems. This list ranks the academic nightmares that often keep future engineers awake at night, offering a glimpse into the challenges that lie ahead in their demanding educational journey. Which subject will reign supreme as the ultimate "ฝันร้าย"?