Chimney Top Calculators

How to use the study section

Quizzes, flashcards and free courses with explanations and sources. No account; progress stays in your browser.

Study: quizzes

  1. Open Study from the top menu

    Topics, flashcards and free courses start at /study/.

  2. Read a sub-topic page, then try its short sample quiz

  3. Topic quiz: 10 questions, pick a sub-topic or take them all

  4. Choose an answer, then press Check answer

    The explanation and its source appear straight away.

  5. Free-recall questions: Show answer, then mark yourself right or wrong

  6. See your score at the end, then retry or get a new set

  7. Spotted a mistake? Use "Report a problem" under the explanation

Study: flashcards

  1. Open Flashcards and pick all sub-topics or one

  2. Read the card, then press Show answer

  3. Rate it: 1 Again · 2 Hard · 3 Good · 4 Easy

    Buttons or the number keys.

  4. The scheduler (SM-2) brings each card back before you forget it

  5. "All caught up" means nothing is due: come back tomorrow

Study: progress, backup and offline

  1. Your progress panel shows cards studied, quizzes and best score

  2. Export progress (JSON) to keep a backup

  3. Import progress on another browser or device

    It merges with what is already there.

  4. Install the study section: browser menu, Install or Add to Home screen

  5. Pages you have visited then open offline

Free courses

  1. Course
  2. Lesson
  3. Module quiz
  4. Next lessonback to Lesson

  1. Open All courses from the Study page

  2. Press Start with lesson 1, or pick any lesson

  3. Each lesson lists its objectives and sources

  4. Take the practice quiz after each module

  5. The course page shows lessons opened and best quiz scores

Study symbols and statuses

Correct.
Your answer matched; the explanation follows.
Not quite.
The right answer is highlighted, with the explanation.
DRAFT
Not yet reviewed. Shown only in preview builds; the public site publishes reviewed lessons and questions only.
Opened / Not opened yet
Whether you have read a course lesson in this browser.
Best quiz score
Your best module-quiz result in this browser.
Reviewed before publication
When the question was reviewed, and its version number.

Study: common problems

  1. Progress is missing on my phone → export here, import there

  2. Import failed → use the JSON file exported from this site (under 2 MB)

  3. No flashcards left → nothing is due; come back tomorrow or take the quiz

  4. "Questions are with our reviewer" → that section is not published yet

  5. "Lessons in review" → the lesson is published after review

  6. A page will not open offline → visit it once while online first

Your data

  1. No accounts: answers, scores and cards stay in this browser

  2. Export progress to keep a copy; import it anywhere

  3. Anonymous usage data can be switched off on the Privacy page

    Only the quiz topic and a score band are sent, never your answers.

The full guide, including the calculators, is on the Help page.