608 Practice

AHDS

About this app

Prepare for your Section 608 certification exam with the most comprehensive study app available. Whether you're going for Type I, Type II, Type III, or Universal certification, 608 Practice has everything you need to pass.

Hundreds of Practice Questions Study from a massive question bank covering all four exam sections: Core, Type I, Type II, and Type III. Every question has four answer options and a detailed explanation, just like the real exam. New questions are added regularly.

Pressure-Temperature Chart Questions Practice reading PT charts the way you will on the real exam. An interactive chart covering R-22, R-134a, R-410A, R-404A, and R-32 is built right into the questions. Calculate superheat, subcooling, identify refrigerants, and compare pressures across different refrigerants.

5 Study Modes Per Section

Cram Mode - Read through every question with the correct answer and explanation shown. Absorb the material before testing yourself.
Study - Answer questions at your own pace with instant feedback. Your position is saved so you can pick up where you left off.
Smart Practice - The app tracks what you get wrong and builds focused sessions around your weak spots. 75% of questions come from your weakest areas, 25% from material you haven't seen yet. Questions you master (3 correct in a row) are excluded so you spend time where it matters.
Mock Exam - Simulate the real exam with 25 random questions. 72% required to pass, just like the actual certification test. Review your answers with full explanations after each attempt.
Most Missed - See which questions you get wrong most often, organized by section. As you master questions, they leave the list automatically.
Track Your Progress

Study streak counter to keep you motivated
Per-section readiness scores
Mastery tracking for every question (3 correct answers in a row = mastered)
Best test scores by section
Full history of practice and test results
Study Reminders Set daily or weekly notifications to keep your study habit consistent. Choose your preferred time and frequency.

Works Offline All questions are stored on your device. Study anywhere, anytime, with no internet required. Questions sync automatically in the background when updates are available.

Built for the Real Exam

72% passing score, matching the actual Section 608 exam
25 questions per test, same as the certification
Four answer options per question, just like the real thing
Covers all current regulations including the AIM Act and 2026 rule changes

Ratings and reviews

1. great little app to study epa (just got my universal). It's very accessible, you can do the tests anywhere, doing a test or two on a break or while your wife shops in the mall. 2. questions are pretty accurate. on my test I didn't see a lot they had for the core section but a lot for 2 and 3. some of them were word for word 3. I wouldn't rely solely on this app, it's just nice and easy. make sure you go to other places or take a class

Very good practice app! The questions are right even though occasionally the grammar seems off. Try to work all the way through the study mode for each section, rather than focusing on the practice tests. There are many similar, not-too-difficult questions in each section pool, but then there are a few that are tough to remember that might show up on your test. The practice tests will give you lots of easy questions and a few hard ones, but you need to study the hard ones. One function that would really make this app excellent would be the ability to remove easy questions from the pool so you could only practice the hard-to-remember ones. Or if there were a "personal deck" that you could save hard questions to. Anyway, thanks!

Update is terrible. Questions aren't close to exam. Half the questions referring to PT chart doesn't show the refrigerant the question is about. If you have the old version DO NOT UPDATE!!!!

What’s new

• App now available in Spanish (Latin American): full UI and all
questions translated
• New bookmark filter in Cram and Study, so you can review just your
flagged questions
• Backup & Restore in About: save or load your progress from a file (great
for moving between devices or backing up before exam day)