Becoming a trucker is far more complicated than simply passing a written test. The trucking industry requires a strong mind, an ability to get along with people, as well as an ability to get along without anyone at all. There are many obstacles that rookie drivers must face. Increase your chances of success by reading this excellent post over at TruckingTruth.com:
http://www.truckingtruth.com/trucking_blogs/Article-3697/why-many-rookie-truck-drivers-fail