Taking practice tests that simulate your states actual knowledge test will give you confidence and prepare you for the actual thing our cdl test questions are based on your states official manual so youll know what to expect these tests are valid for both commercial driver license and cdl permit clp watch cdl videos. Commercial learners permit clp cdl practice quiz getting on the road is more than just earning a commercial drivers license cdl just as you have to get a learners permit before getting your regular drivers license you need to earn a commercial learners permit clp before you can earn your cdl. Commercial drivers require advanced knowledge and skills beyond those needed to drive lightweight cars hence since 1st april 1992 drivers are required to obtain the cdl commercial drivers license in order to drive and operate commercial motor vehicles in the united statesto obtain this cdl you need to study the cdl manual and pass the 50 multiple questions test with over 80 percent. While there are other requirements for becoming a truck driver like being at least 18 years old and passing a physical exam passing the cdl test is a must so if you will be taking the cdl test anytime soon then it would be a good idea to study here are some ways to prepare for the cdl test becoming a truck driver means having a clean driving record having no history of felony and passing a physical exam every two years