Opening your handbook…
Interactive practice needs JavaScript.
Your answers and progress are saved in this browser. Each device has its own history. Clearing browser data deletes saved work.
Starting a new practice session replaces that session’s saved answers. Chapter drafts are saved separately.
Progress shows the latest saved result for each exercise. “Correct with help” includes hints, revealed answers, blanks, and guided groups. Corrections are recorded separately.
Each exercise and photo has its own results. Results from an older answer version stay in history.
Download a backup to keep your progress or move it to another browser.