Practice exams are a great way to prepare for your official HVAC test!
And this is the best website in the web to prepare yourself for your license exam:
Like any test, successfully passing your exam solely rests on how much effort you decide to put into preparing for it. In combination with your HVAC/HRAC course materials and notes, this practice mock exam has been prepared for the sole reason of helping you succeed. This test has been prepared in a way so completing it will adequately prepare you for the official exam in your State or Province. The questions, the difficulty, and the format are all in accordance to what you will encounter on the actual test. Your ability to practice as a licensed skilled technician rests on passing this test.
In http://hvac-exam-guide.com/ there are also a bunch of FREE TEST !
Good luck in your Gas Technician test!!