Practice tests are scientifically proven to increase exam pass rates . See how CDL PREP EXAM: Passenger Endorsement can help to improve your chances of passing your CDL written tests. The commercial driver industry is fast-growing yet continuously faced with a shortage of certified CDL drivers. Certification starts with passing the CDL written exam and that's where many fall short. We aim to change that trend. We also aim to enhance the learning experience of new commercial drivers and improve their driving capabilities. The beginning of a new career path in the transportation industry starts with the CDL test . We're here to help you or your students over that speed bump and onto the next mile. We are obsessed with helping our customers improve their CDL pass rates . We know how a CDL certification or endorsement can transform your future . It did ours. So, we never stop working to improve our resources to ensure you can make your mark in this lucrative, in-demand career path.