The written portion of a Class A commercial drivers license test has many practice options available online including those from Christcdl.com, DMV.org and TruckerCountry.com. The core material covered by each individual test is similar, allowing a user to select the presentation that is most comfortable for his needs.
In addition to the general knowledge written test requirement to earn a Class A CDL, there are other written tests to lift restrictions. TruckerCountry.com lists most of these on as part of its CDL written test practice program, including tests regarding air brakes, hazardous materials and tanker vehicles. These specific written tests are taken after passing the general CDL written test.