Barber Exam Prep

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- Added 1,000 barber board exam practice questions
- Added detailed explanations and study references
- Added flashcards for fast review
- Added timed mock exam mode
- Added progress tracking and bookmarks
- Added color formula calculator
- Added chemical service timer
- Added sanitation checklist
- Added client analysis and chemical safety tools
- Added Pro access with monthly, annual, and lifetime options
- Improved Google Play purchase, restore, and unlock flow