1. Khan Academy – A comprehensive online learning platform offering lessons in various subjects with interactive exercises and quizzes.

2. Quizlet – A popular study tool that allows students to create flashcards and study sets. It also offers various study games and practice tests.

3. Duolingo – An app for learning different languages through interactive lessons, games, and challenges.

4. Grammarly – A helpful tool for checking grammar, spelling, and punctuation mistakes in written assignments and essays.

5. Photomath – An app that allows students to solve math problems by simply taking a picture with their phone’s camera.

6. Google Drive – A cloud storage platform that allows students to store and access files, collaborate on documents, and create presentations.

7. Forest – An app that helps students stay focused and avoid distractions by planting virtual trees when they commit to a study session.

8. Evernote – A note-taking app that allows students to organize their notes, create to-do lists, and capture ideas with text, images, and audio recordings.

9. Wolfram Alpha – A powerful computational knowledge engine that can solve complex math problems, provide explanations, and offer insights on various topics.

10. EasyBib – An app that generates citations and bibliographies in multiple formats, saving time
and ensuring proper referencing.

11. TED – An app that provides access to thousands of inspirational and educational TED Talks, covering a wide range of subjects.

12. StudyBlue – An app that allows students to create and share study materials, including flashcards, notes, and practice quizzes.

13. Adobe Scan – An app that turns your phone into a portable scanner, allowing students to easily digitize and organize their notes and documents.

14. Coursera – An online platform offering free courses from top universities and institutions, perfect for expanding knowledge on various subjects.

15. Todoist – A powerful task manager that helps students stay organized and prioritize their assignments, projects, and deadlines.

These free apps can be valuable tools for students in junior high and high school, enhancing their learning experience, improving organization, and supporting their academic success.