Our CDL Practice test app is a very useful tool for those seeking their CDL license or an endorsement. This app contains randomly generated tests for each subject. These are the tests that this app covers: 1) General Knowledge 2) AirBrakes 3) Combination Vehicles. It also covers the optional endorsements, 1) Hazmat 2) Tanker 3) Passengers 4) School Bus 5) Doubles/Triples. We have a question bank of over 600 questions. We do not have a set test, each test is randomly generated. Each question is combined with a 'study button' that will give you the information required to answer each particular question. This CDL practice test app will not only help you learn by repetition but you also have the study information there for you as well. You no longer have to pay high monthly fees or purchase expensive CDL study guide books, you can now have all the same information in an interactive format for only $3.25. If later on you decide to take another endorsement test you still have this app to help.