Dojoru

Dojoru

About this app

Dojoru is an unofficial practice app specializing in preparation for IT-related certifications such as AWS and Claude. Currently, it supports four exams: "AWS Certified Solutions Architect – Professional (SAP-C02)," "Claude Certified Architect – Foundations (CCAR-F)," "Claude Certified Architect – Professional (CCAR-P)," and "Claude Certified Developer – Foundations (CCDV-F)."

It focuses on a cycle of "solve → record reasons for mistakes → review only weak points," and is designed to allow users to start practicing immediately even during short breaks. Learning data is saved on the device and can be used offline.

*Dojoru is an unofficial app unrelated to Amazon Web Services, Inc., Anthropic, PBC, and Tutorials Dojo. Please see the "Disclaimer" at the end of this text for details.

■Recommended for:
・Those preparing for AWS SAP-C02 or Claude certification exams who want to practice problems during their commute or other spare time.
・Those who want to review incorrect answers not just "vaguely," but by organizing them according to the reasons for their mistakes.
・Those who simply want to focus on practice and review.

■Supported Certification Exams
You can switch between exams you study within the app at any time. The review queue and weakness analysis are compiled based on the questions of the selected exam.

〈AWS Certified Solutions Architect – Professional (SAP-C02)〉
Contains questions equivalent to one full exam, according to the weighting ratio of the exam domains.

〈Claude Certified Architect – Foundations (CCAR-F)〉
Contains all 55 questions corresponding to Anthropic's official Claude certification program. It covers five exam domains: agent design and orchestration, tool design and MCP integration, Claude Code configuration and workflow, prompt engineering and structured output, and context management and reliability, according to the official weighting ratio. Since the CCAR-F exam is primarily in English, you can switch between English and Japanese with a single tap while taking the test. If you answer in English, the Japanese translation will be displayed alongside your answer afterward (explanations are in Japanese).

〈Claude Certified Architect – Professional (CCAR-P)〉
This is a higher-level exam in the same architect category as the CCAR-F, and includes 63 corresponding questions. It covers seven domains: Solution Design and Architecture, Model Selection and Prompt/Context Design, Integration, Evaluation, Testing and Optimization, Governance, Safety and Risk Management, Stakeholder Communication and Lifecycle Management, and Developer Productivity and Operational Enablement, according to the official scoring ratio. Like the CCAR-F, the CCAR-P exam is primarily in English, allowing you to switch between English and Japanese with a single tap. If you answer in English, the Japanese translation will be displayed alongside your answer afterward (explanations are in Japanese).


This exam is a foundational level exam for the Developer certification, separate from the Architect certification. It includes 53 questions covering eight domains: Agents and Workflows, Applications and Integrations, Claude Code, Evaluation, Testing and Debugging, Model Selection and Optimization, Prompts and Contextual Engineering, Security and Safety, and Tools and MCPs, all according to the official scoring ratio. Since the CCDV-F exam is primarily in English, like the CCAR-F and CCAR-P, you can switch between English and Japanese with a single tap. If you answer in English, a Japanese translation will be provided afterward (explanations are in Japanese).

In addition to this, there is also the Claude Certified Associate – Foundations (CCAO-F) certification. Support for this certification is planned for the future, but the start date and content are yet to be determined.

■Key Features

〈Record incorrect answer reasons with one tap and visualize weaknesses by tag〉
For incorrect answers, you can select reasons such as "lack of knowledge," "overlooked conditions," or "incorrect choice in a two-choice question" with a single tap. The system compiles data by question domain and topic tags, reflecting a weakness analysis screen that delves into "what you didn't understand."

〈SRS (Spaced Repetition) Review Queue: Review comes when you least expect it〉
The system employs a spaced repetition method (Leitner system). Correct answers extend the review interval, while incorrect answers return you to the redo queue. The home screen displays "Today's Review Count," designed to reduce the burden of having to review everything at once.

〈Explanations for all answer choices, including "explanations of trick questions">
Explanations are provided not only for the correct answer choices but also for the incorrect choices. For seemingly plausible incorrect choices, explanations detailing the "trick" structure are included.


You can choose from four modes for practice: Category-based, Random, Weakness-Focused, and Review of Incorrect Answers. Category-based practice is also supported, taking into account the point distribution ratio of each learning domain.

<"Growth Potential Champion" - Weaknesses Become Titles>
Based on weakness data categorized by tags and reasons for incorrect answers, slightly humorous "nickname" type titles are displayed, such as "IAM Lost," "Uses Every Tool," "The Kid Who Finishes a Book Report in One Night," and "The Person Who Calls a Chef to Make Instant Noodles." The area with the most potential for improvement is displayed at the top of the screen as "Your Growth Potential Champion," and tapping it leads to the origin and questions designed to overcome that weakness. Titles are only displayed on your own screen, and you can choose whether or not to share them (post to X [formerly Twitter]). Learning data itself is never sent externally.


You can switch between three patterns from the settings screen: Light/Dark/Linked to System Settings. This is designed with nighttime and dark environment learning in mind.


The home screen displays the number of consecutive learning days. This visualizes the accumulation of spare time, encouraging continued learning.

■Current Availability
・Supported OS: Android
・Communication: Learning and practice are completed using data stored on the device, allowing for offline use.
・Included Questions: AWS SAP-C02 includes questions equivalent to one full exam, following the point distribution ratio of the exam domains. Claude certifications include all 55 questions for CCAR-F, all 63 questions for CCAR-P, and all 53 questions for CCDV-F, all following the official point distribution ratios.

■Disclaimer
・Dojoru is an unofficial learning material unrelated to Amazon Web Services, Inc. "AWS" and related trademarks are trademarks of Amazon Web Services, Inc. or its affiliates.

・Dojoru is an unofficial learning material unrelated to Anthropic, PBC. "Claude" and related trademarks are trademarks of Anthropic, PBC.

* Dojoru is an independent product unrelated to "AWS SAP-C02 Dojo Exam" or other products offered by Tutorials Dojo Inc. Although the name shares the word "Dojo," there is no partnership, licensing, or collaborative relationship between the two.

* The exam questions are independently created based on the official guides and publicly available information for each certification exam, and are not reproductions of the actual exam questions or copies of commercially available question sets.

What’s new

・Claude公式認定資格「Claude Certified Developer – Foundations(CCDV-F)」に対応しました(全53問)。8つの出題ドメインを公式の配点比率に沿ってカバーします。
・Claude公式認定資格「Claude Certified Architect – Professional(CCAR-P)」にも対応しています(全63問)。7つの出題ドメインを公式の配点比率に沿ってカバーします。
・ホームの試験切替から、AWS SAP-C02・CCAR-F・CCAR-P・CCDV-Fをいつでも行き来できます。CCAR-P・CCDV-Fも、CCAR-Fと同じく英語と日本語を1タップで切り替えて解け、英語で解いた場合は回答後に日本語訳を併記します。
・CCAR-P・CCDV-F専用の「伸びしろ番長」称号を追加しました。
・初回起動時、学習する試験を選ぶ画面で試験を選んでも次の画面に進めない場合がある不具合を修正しました。
・ランダム演習・カテゴリ別演習で、未実施の問題や直近の正答率が低い問題を優先して出題するようにしました。