"The Forest of Three Types of Refrigeration" is a learning app for past questions of the Third-Class Refrigeration Machine Operator Examination.

[Main Features]

● Automatic Question Generation Mode
→ This is the most recommended mode. It features an algorithm based on the forgetting curve. Based on your correct/incorrect history of the past three attempts and the elapsed time, it automatically presents questions that you should review at the optimal time. You don't need to think, "Which questions should I solve today?" Simply launch the app, tap "Automatic Question Generation Mode," and continue solving the presented questions to approach a passing level of proficiency.

● Question Selection Mode
→ You can freely extract questions based on year, subject, correct/incorrect history, etc. You can choose and study questions at your own pace.

● Mock Exam Mode
→ You can take a mock exam with questions randomly selected from all unlocked questions. Once you've gained some proficiency, test your skills in this mode.

● Learning History Saving
→ The correct/incorrect history for each question is saved for up to the past 10 attempts. You can see your weak points at a glance.

● Bookmark Function
→ You can collect only the problems you're interested in and review them all at once later.

● Drawing Function
→ You can take handwritten notes while solving problems, allowing you to solve problems in an environment similar to the actual exam!

● Memo Function
→ You can leave notes for each problem. You can jot down hints for solutions and review them later.

● Explanations for All Problems
→ It doesn't just end with checking the answers! Explanations are included to deepen your understanding.

● The Forest Grows with Your Effort
→ The forest on the home screen grows little by little for every approximately 20% of your learning progress. Let's work hard to complete the forest!

【Other】
● In-App Purchases: 2019 Problems are Free
→ All problems from 2019 to 2025 are unlocked with an in-app purchase (one-time purchase).
→ Once purchased, problems from subsequent years will be automatically added.

● Ad-Free & Fully Offline Compatible
→ A quiet design that allows you to concentrate on your studies.

[Recommended for those who:]
* Aim to pass the exam through self-study
* Want to study efficiently during their commute or in their spare time
* Want to identify their weaknesses and focus on reviewing them
* Are struggling with the cycle of "memorizing and forgetting"

* This app is not the official app for the Third-Class Refrigeration Machine Operator Examination and is not affiliated with any government agency or public organization.