CDL Coach is a study aid that helps you prepare for the U.S. Commercial Driver's License (CDL) knowledge test with English questions, Chinese explanations, mock exams, wrong-answer review, and roadside-inspection English practice.
CDL Coach 是一款备考学习工具，用英文题目、中文解释、模拟考、错题复习和路检英文练习，帮助你准备美国商业驾照（CDL）笔试。
Contact us / 联系我们
We usually reply within 1–2 business days. Please include your iOS version and a short description of the issue.
我们通常在 1–2 个工作日内回复。请附上你的 iOS 版本和问题简述。
Frequently asked questions / 常见问题
What is free, and what needs Pro?
Free: the General Knowledge module (first 50 questions) and Roadside English (first 30). Pro unlocks all 10 modules and 470+ questions, 10 / 25 / 50-question mock exams, and full wrong-answer & starred review.
免费：通用知识模块（前 50 题）和路检英文（前 30 题）。Pro 解锁全部 10 个模块、470+ 道题、10 / 25 / 50 题模拟考，以及完整的错题与收藏复习。
How do I restore a purchase?
Open the upgrade screen (“升级”) and tap “恢复购买 / Restore Purchases”. Make sure you are signed in with the same Apple Account used for the original purchase.
打开“升级”页面，点击 “恢复购买”。请确保使用与原购买相同的 Apple 账户登录。
How do I cancel the monthly subscription?
On your iPhone: Settings → [your name] → Subscriptions → CDL Coach → Cancel Subscription. The subscription auto-renews unless cancelled at least 24 hours before the end of the current period. Pro Unlock and Lifetime are one-time purchases and do not renew.
在 iPhone 上：设置 → [你的名字] → 订阅 → CDL Coach → 取消订阅。除非在当前周期结束前至少 24 小时取消，订阅会自动续订。“Pro 解锁”和“终身解锁”为一次性购买，不会续订。
How do I reset my study data?
In the app, go to the “我的” (Profile) tab and choose “重置进度 / Reset progress”. All study data is stored only on your device; deleting the app also removes it.
在应用内进入 “我的” 标签，选择 “重置进度”。所有学习数据仅保存在你的设备上；删除应用也会一并清除。
Is this an official exam app?
No. CDL Coach is an independent study aid. It is not affiliated with, endorsed by, or sponsored by any DMV, the FMCSA, or any government agency, and it does not guarantee exam results. Content is based on the federal (FMCSA) rules and the California Commercial Driver Handbook; always confirm your own state's current official handbook before testing.
不是。CDL Coach 是独立的学习工具，与任何 DMV、FMCSA 或政府机构均无关联，也不保证考试结果。内容基于联邦（FMCSA）规则与加州商业驾驶手册；考试前请以你所在州的最新官方手册为准。