Masters Plumbing & Gas School also offers refresher courses so that you can prepare for your state exams or licensure exams with confidence. "Express" Course lets you attend part of a Tier 5 course to review materials that will be on the state exam. It's a once-a-week course for 12 weeks. On the other hand, Refresher Course is a quicker and more intensive course with the aim to practice what you learned. Choose your course today so you can ace those state exams! Check out our schedule to secure a slot. There are great job opportunities in the plumbing and gas industry, especially with the thousands of homes throughout the US needing maintenance and repairs for their water, heating, and sewer systems.