The CDL Prep & Practice Test app is a free tool designed to help individuals prepare for the CDL test. This app is specifically designed for those who wish to drive or operate vehicles that carry more than 8 passengers, exceed gross vehicle weight rating (GVWR), or transport hazardous materials. The app contains questions from the actual CDL exam held in 2017, 2018, 2019, 2020, and 2021. It covers various categories including endorsement tests such as Class A CDL Test, Class B CDL Test, General Knowledge, Air Brakes, Cargo Transport, Combination Vehicles, Double/Triple Trailers, HazMat (Hazardous Materials), On-Road Driving, Passenger Transport, Pre Trip Inspection, School Bus, and Tanker.

The CDL Prep app offers four modes of learning: Learn, Take Test, Study Guide, and Flashcards. The Learn mode provides different CDL Prep learning sets designed to provide a unique learning experience. The Take Test mode allows users to test their knowledge before taking the permit test. The Study Guide mode helps users prepare for the commercial driver license test by providing a reference, cheat sheet, or learning book. The Flashcards mode provides a feel of using physical flashcards for learning while using this section.

The app features a total of 1484 unique learning sets to study for the DMV CDL test, 1484 unique questions covered in 44 free CDL practice test papers, and a study guide which users can read at their pace to gain a thorough understanding of the general knowledge and all endorsement sections. The app provides instant feedback (true or false & highlights correct answer) after users attempt the practice test questions. This method of feedback is very important for learning from mistakes and avoiding them in the future. The app works offline, allowing users to use this CDL quiz app without an internet connection.

The CDL Prep & Practice Test app is available for any of the 50 USA states and covers the following tests: Alabama CDL (AL), Alaska CDL (AK), Arizona CDL (AZ), Arkansas CDL (AR), California CDL (CA), Colorado CDL (CO), Connecticut CDL (CT), Delaware CDL CDL (DE), Florida CDL (FL), Georgia CDL (GA), Hawaii CDL (HI), Idaho CDL (ID), Illinois CDL (IL), Indiana CDL (IN), Iowa CDL (IA), Kansas CDL (KS), Kentucky CDL (KY), Louisiana CDL (LA), Maine CDL (ME), Maryland CDL (MD), Massachusetts CDL (MA), Michigan CDL (MI), Minnesota CDL (MN), Mississippi CDL (MS), Missouri CDL (MO), Montana CDL (MT), Nebraska CDL (NE), Nevada CDL (NV), New Hampshire CDL (NH), New Jersey CDL (NJ), New Mexico CDL (NM), New York CDL (NY), North Carolina CDL (NC), North Dakota CDL (ND), Ohio CDL (OH), Oklahoma CDL (OK), Oregon CDL (OR), Pennsylvania CDL (PA), Rhode Island CDL (RI), South Carolina CDL (SC), South Dakota CDL (SD), Tennessee CDL (TN), Texas CDL (TX), Utah CDL (UT), Vermont CDL (VT), Virginia CDL (VA), Washington CDL (WA), West Virginia CDL (WV), Wisconsin CDL (WI), and Wyoming CDL(WY). Users can contact the developer if they find any issues with the app.