# 電工二種の森（第二種電気工事士試験対策アプリ） > A study app for past questions of the Class 2 Electrician's License Examination. Learn quickly with 1000 questions from the past 20 exams + automated question generation based on the forgetting curve! Canonical page: [https://chrome-stats.com/d/work.builmen.denkou2](https://chrome-stats.com/d/work.builmen.denkou2) ## Overview - **ID:** `work.builmen.denkou2` - **Platform:** Android - **Type:** Android app - **Status:** Available - **Publisher:** 合同会社OLA - **Category:** EDUCATION - **Downloads:** 205 - **Version:** 2.0.2 - **Last updated:** 2026-09-09 - **First published:** 2026-04-01 - **Publisher country:** JP - **Size:** 143 MB - **Data as of:** 2026-09-11 - **Store listing:** [Google Play Store](https://play.google.com/store/apps/details?id=work.builmen.denkou2) - **Website:** [https://olapps.jp/app](https://olapps.jp/app) - **Privacy policy:** [https://builkan.net/pp-dk2](https://builkan.net/pp-dk2) ## Description "Denko 2-shu no Mori" is a learning app for past questions of the 2nd Class Electrician's License 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 by year, genre, 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.

● Your Efforts Grow the Forest
→ 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!

● Earn Coins by Learning and Collect Animals!
→ You earn forest coins with each lesson, and you can invite animals to your forest. Let's aim to complete the animal encyclopedia!

【Other】
● Paid Features: Questions from the first half of 2019 are available for free.
→ In-app purchase unlocks all questions from the first half of 2019 to the second half of 2025 (one-time purchase).
→ Once purchased, questions for subsequent years will be automatically added.

● Ad-free and fully offline compatible
→ Quiet design for focused learning.

【Recommended for those who:】
・Are studying for the Class 2 Electrician's License Examination independently.
・Want to study efficiently during commutes and spare time.
・Want to identify weaknesses and focus on review.
・Are struggling with the cycle of "remembering and forgetting."

"Like a forest, steadily build up your skills."

That's "The Forest of Plumbing."

Why not cultivate your own forest?

*This app is not the official app for the Class 2 Electrician's License Examination and is not affiliated with any government agency or public organization. ## Rankings - #1,701,265 — Overall ## Permissions and access ### Permissions - `android.permission.ACCESS_NETWORK_STATE` - `android.permission.INTERNET` - `android.permission.POST_NOTIFICATIONS` - `android.permission.VIBRATE` - `com.android.vending.BILLING` - `work.builmen.denkou2.DYNAMIC_RECEIVER_NOT_EXPORTED_PERMISSION` ## Similar extensions and apps - [第二種電気工事士 電工二種 試験対策 非公式アプリ](https://chrome-stats.com/d/net.jp.apps.appbanker.dai2denki) — 337 users - [2級ボイラーの森（2級ボイラー技士試験対策アプリ）](https://chrome-stats.com/d/work.builmen.boira2) — 2,447 users - [電気工事士２種 過去問（完全版）](https://chrome-stats.com/d/com.harusankaigo.kakomon.DenkiGrade2Pro) — 204 users - [電気工事士２種 過去問（解説投稿型）](https://chrome-stats.com/d/com.harusankaigo.kakomon.DenkiGrade2) — 1,159 users - [二級建築士の森（二級建築士学科試験対策アプリ）](https://chrome-stats.com/d/work.builmen.kenshi2) — 42 users - [電気工事士2種 試験対策 過去問・筆記](https://chrome-stats.com/d/com.kohei.denkistudy) — 36 users - [第二種電気工事士 一問一答](https://chrome-stats.com/d/com.asobichiru.denki_koji_2) — 22 users - [電気工事士2種 【解説付き 一問一答 問題集】](https://chrome-stats.com/d/ym.ui05) — 5,178 users - [第2種衛生管理者の森（第2種衛生管理者試験対策アプリ）](https://chrome-stats.com/d/work.builmen.eisei2) — 500 users - [電気工事士 過去問マスター](https://chrome-stats.com/d/com.tondev.denkoumaster) — 53 users - [電気工事士2種 合格ドリル](https://chrome-stats.com/d/com.quizfactory.denki2quiz) — 217 users - [電気工事士2種：ゼロから学べる第二種電気工事士の基礎＋過去問](https://chrome-stats.com/d/com.zerokara_denkou_2) — 34,916 users --- Source: [Chrome-Stats](https://chrome-stats.com/d/work.builmen.denkou2)