This is an app that allows you to study along with reference books and problem sets published by Izuna Shoten.
The books you can study are listed below.

[English teaching materials]
Comprehensive English be 3rd Edition
Comprehensive English Comprehensive English be 4th Edition
Comprehensive English Evergreen
English Grammar and Vocabulary Vintage New Edition
English Grammar and Vocabulary Vintage 3rd Edition
English Grammar and Usage Vintage 4th Edition
English grammar and usage Engage
English Grammar and Usage Engage New Edition
English Grammar and Usage Engage 3rd Edition
EG 3000 English Vocabulary and Idioms New Edition
EG 4500 Plus English words/idioms
Cheer 3000 Furefure English Vocabulary New Edition
MEW Exercise Book Core 500
MEW Exercise Book Days 1200
MEW Exercise Book Expansion 1400
MEW Exercise Book Frontier 1600
Bricks1
Bricks2

[Japanese language teaching materials]
Ancient Japanese Words 330 Revised Edition
Ancient Japanese words 330 third edition
Ancient Japanese words 330 4th edition
Quickly memorize 300 ancient Japanese words + 30 honorific words, revised edition
300 ancient Japanese words to quickly memorize + 30 honorific words 3rd edition
Ancient Japanese words that connect and summarize 500 PLUS
University Entrance Examination Kanji TOP2000 Revised Edition
University Entrance Examination Kanji Top 2000 Third Edition
Top 2000 Kanji for University Entrance Exams, Fourth Edition
Frequently appearing kanji in entrance exams + important modern vocabulary TOP2500 revised edition
Kanji frequently used in entrance exams + important vocabulary in modern texts TOP2500 third edition
Japanese Frequently Asked Questions 1200 Third Edition
Japanese Frequently Asked Questions 1200 Fourth Edition
Modern Sentence Vocabulary Gentan Revised Edition
New modern vocabulary revised edition

There are six learning methods: ``Listening study'', ``Flashcards'', ``Practice problems'', ``Sorting problems'', ``Multiple questions'', and ``Video lectures''. (*Some learning methods may not be supported depending on the book.)

いいずなラボ 参考書・問題集版

いいずなラボ　参考書・問題集版