This test can be repeated as often as wanted. The Exam has 18 questions and a 40 minute time limit. The questions come from a larger bank of questions and are randomly chosen each time you attempt the test. Note - The tests are closed book, and the answers to these questions will demonstrate your competence level on this subject. Please avoid using reference material. Failing the exam is an indicator that you need to undertake training. (Our Gas Installer Pro Training Pack will assist with this).