CDL Prep

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

Jeffrey Diaz · com.jeffreydiaz.android.app.cdlprep

Not rated yet 1M+ downloads v9.13 9.3 MB Android 6.0+ PEGI 3 · Everyone

Download APK 9.3 MB All versions

Signature matches the Google Play version Details

At a glance

Latest version: v9.13 (178)
Updated: Aug 9, 2026 (2 months ago)
APK size: 9.3 MB
Requires: Android 6.0+ (API 23)
CPU support: x86 32-bit, x86 64-bit, ARM 32-bit, ARM 64-bit
Category: Education (app)
Listed since: Jun 13, 2021 (at least)
Permissions: 10
Developer contact: [email protected]
Privacy: Developer's privacy policy

About this APK

CDL Prep is an app by Jeffrey Diaz in the Education category, listed since at least June 2021. It includes native code for x86 32-bit, x86 64-bit, ARM 32-bit and ARM 64-bit, so it runs on practically every phone.

Since version 9.5.1, the minimum Android version rose from 5.0 to 6.0. It asks for 10 permissions, none of them sensitive. It asks for the same permissions as version 9.12. The app can read the advertising ID that ad and analytics services use.

What's new in v9.13

Minor bug fixes and grammatical corrections.

Description

From the listing uploaded by “appupdater”.

CDL Prep is the best way to prepare for the Commercial Drivers License General Knowledge, and various endorsement exams. CDL Prep contains questions on the following topics: General Commercial, Air Brakes, Combinations, Hazmat, Passenger, Tanks, School Bus, and Doubles/Triples. Features: 1. Over 500 questions to practice with. 2. Exam Mode - 60 minutes to answer 50 randomly chosen questions, or 40 minutes to answer 20 to 30 questions on endorsement topics. At the end, review your score and any incorrect answers. 3. Practice Mode - Answer questions and receive instant feedback if you answered incorrectly. 4. Answer Randomization - Answers to questions will not always be in the same position. 5. Performance tracking - Review your performance on every question. Red = You have an average score less than 70%, Orange = You have an average score between 70-89%, Green = You have an average score of 90% and above. Please send any feedback or request to: [email protected]. Thank you and good luck on your exams!

Version history

5 versions are listed, going back to v9.5.1. Since v9.10 it requires Android 6.0+.

v9.13 LATEST Aug 9, 2026 9.3 MB TRUSTED v9.12 Jun 20, 2026 9.4 MB TRUSTED v9.11.1 May 18, 2026 9.3 MB TRUSTED v9.10 May 18, 2026 9.2 MB TRUSTED v9.5.1 Jan 13, 2025 9.3 MB TRUSTED

All 5 versions

Security & authenticity

Security rating: Trusted

Signing certificate

Signature matches the Google Play version Checked by the source store on Aug 9, 2026.
Certificate issued to “Jeffrey Diaz” This is the certificate of the Google Play version.
Same certificate as the 2 other versions checked

Store checks and file details

Developer signature verified Aug 9, 2026
Validated against Google Play Aug 9, 2026
Signed byCN=Jeffrey Diaz, OU=JD, O=Jeffrey Diaz, L=Bronx, ST=NY, C=US
Signing certificate (SHA-1)1A:7C:DF:29:F8:FD:19:4F:2D:A8:F6:0E:AA:C9:03:AD:7C:98:0D:76
File MD517fb29eaee684982ed2b8a505c2e924c
Uploaded by “appupdater” Gold tier · 117,810 followers · uploading since 2020

Scans and ratings come from the source store; the certificate comparisons are AAPKs's own, made from the files' published signatures (2 other versions compared). AAPKs doesn't scan files itself — compare the MD5 and signer after downloading.

Permissions (10)

CDL Prep requests 10 permissions, none of them sensitive.

Access adservices ad id android.permission.ACCESS_ADSERVICES_AD_ID
Access adservices attribution android.permission.ACCESS_ADSERVICES_ATTRIBUTION
Access adservices topics android.permission.ACCESS_ADSERVICES_TOPICS
Advertising ID com.google.android.gms.permission.AD_ID
Full network access android.permission.INTERNET
Google Play install referrer com.google.android.finsky.permission.BIND_GET_INSTALL_REFERRER_SERVICE
Internal broadcast protection (app-defined) com.jeffreydiaz.android.app.cdlprep.DYNAMIC_RECEIVER_NOT_EXPORTED_PERMISSION
Prevent the device from sleeping android.permission.WAKE_LOCK
Run foreground services android.permission.FOREGROUND_SERVICE
View network connections android.permission.ACCESS_NETWORK_STATE

Required hardware & features

Basic touch input android.hardware.faketouch

CDL Prep APK: questions and answers

Is there a version of CDL Prep for older Android phones?

The current version needs Android 6.0 or later. Version 9.5.1 is the newest listed build that installs on Android 5.0 and later. It is an old build: apps that rely on online services may no longer connect when they are this old. Get version 9.5.1 · All versions

Can I install this APK over the version I already have?

Yes, if your installed copy is older. It is signed like the Google Play version, so Android installs it as an update and keeps your data.

Is the CDL Prep APK safe?

No one can promise that a file is safe, but some things can be checked. The source store rates this file Trusted. Its signature matches the Google Play version. It is signed with the same certificate as the 2 other versions checked. After downloading, check that the file's MD5 is 17fb29eaee684982ed2b8a505c2e924c.