# CDL Prep

> Pass your state General Knowledge CDL exam with the help of CDL Prep.

Canonical page: [https://chrome-stats.com/d/com.jeffreydiaz.android.app.cdlprep](https://chrome-stats.com/d/com.jeffreydiaz.android.app.cdlprep)

## Overview

- **ID:** `com.jeffreydiaz.android.app.cdlprep`
- **Platform:** Android
- **Type:** Android app
- **Status:** Available
- **Publisher:** Jeffrey Diaz
- **Category:** EDUCATION
- **Downloads:** 1,469,366
- **Rating:** 4.57 / 5 (5,697 ratings)
- **Version:** 9.13
- **Last updated:** 2026-08-08
- **First published:** 2014-06-11
- **Publisher country:** US
- **Size:** 9.34 MB
- **Data as of:** 2026-09-21
- **Store listing:** [Google Play Store](https://play.google.com/store/apps/details?id=com.jeffreydiaz.android.app.cdlprep)
- **Website:** [https://www.jeffreydiaz.com/](https://www.jeffreydiaz.com/)
- **Privacy policy:** [http://jeffreydiaz.com/cdl\_prep\_privacy\_policy.html](http://jeffreydiaz.com/cdl_prep_privacy_policy.html)

## Description

**CDL Prep** is your ultimate preparation tool for passing the Commercial Driver's License (CDL) General Knowledge exam and various endorsement exams including Air Brakes, Hazmat, Passenger, and more. It features over 500 practice questions covering essential topics such as General Commercial, Combinations, Tanks, School Bus, and Doubles/Triples.

Key features include an Exam Mode with timed tests (60 minutes for 50 questions or 40 minutes for endorsement topics) that allows review of scores and incorrect answers, a Practice Mode providing instant feedback, randomized answer positioning to enhance learning, and detailed performance tracking with color-coded scoring to identify strengths and areas needing improvement. CDL Prep is designed to help you study efficiently and confidently pass your CDL tests.

## Rankings

- #54,599 — Overall
- #116 — Education (Free)

## Permissions and access

### Permissions

- `android.permission.ACCESS_ADSERVICES_AD_ID`
- `android.permission.ACCESS_ADSERVICES_ATTRIBUTION`
- `android.permission.ACCESS_ADSERVICES_TOPICS`
- `android.permission.ACCESS_NETWORK_STATE`
- `android.permission.FOREGROUND_SERVICE`
- `android.permission.INTERNET`
- `android.permission.WAKE_LOCK`
- `com.google.android.finsky.permission.BIND_GET_INSTALL_REFERRER_SERVICE`
- `com.google.android.gms.permission.AD_ID`
- `com.jeffreydiaz.android.app.cdlprep.DYNAMIC_RECEIVER_NOT_EXPORTED_PERMISSION`

## Review summary

Users broadly praise CDL Prep for delivering accurate, exam-like questions that align with real CDL tests and endorsements. The app helps many people pass permits, often on the first attempt, and it covers a wide range of topics and state-specific material (notably NY and Minnesota). However, reviewers warn that ads can be intrusive, some topics like Hazmat are missing, and a few questions have duplicates or lack reporting options. There are occasional UX quirks, such as not resuming a mid-test after backing out and a lack of explanations for answers.

### Pros

- Questions closely mirror real CDL exam content and are highly accurate.
- Helps users pass CDL permits and endorsements, often on the first attempt.
- Covers a wide range of topics and endorsements (General Knowledge, Air Brakes, Passenger, Tank, etc.).
- Useful region-specific prep for state exams (works well for NY and Minnesota).

### Cons

- Ads and pop-ups can be intrusive and disrupt studying.
- Some topics are missing or not fully covered (e.g., Hazmat questions).
- Occasional question issues like duplicate answers and no easy way to report errors.
- Some UX issues: back button can cause you to lose progress; limited context/explanations for answers.

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Source: [Chrome-Stats](https://chrome-stats.com/d/com.jeffreydiaz.android.app.cdlprep)