Get one step closer to becoming a South Carolina Commercial Plumber with a prep course designed by Upstryve to help you conquer the required South Carolina Plumber computer based examination.Test-taking techniquesHighlighting and tabbing locations for your booksPractice exams with hundreds of questionsThere are 80 questions in this examination. You will need to answer 56 questions correctly in order to pass. You are allowed 4 hours to complete this examination.All Plumbers - Commercial Contractor candidates are required to pass the Business Management and Law for Commercial Contractors Examination and the Plumber Examination.