olanrewaju08325/Tonex-cbt-app

Tonex CBT — A premium, unified Computer-Based Testing (CBT) and examination prep engine designed for UTME, JAMB, and Post-UTME aspirants in Nigeria. Built on React 19, TypeScript, Vite, Tailwind CSS v4, and Supabase, Tonex CBT delivers a high-fidelity exam simulation experience, interactive study tools, and multi-tier subscription controls. # 🏆 Tonex CBT Tonex CBT is a premium, unified Computer-Based Testing (CBT) and examination prep engine designed specifically for UTME, JAMB, and Post-UTME aspirants in Nigeria. This platform delivers a high-fidelity exam simulation experience mimicking actual university screening environments, complete with comprehensive performance analytics, automated study tools, and multi-tier subscription gating. --- ## 🚀 Key Features ### 1. Real-time CBT Exam Simulator * **Real UTME/JAMB Sandbox**: Practice under realistic constraints with support for up to 4 subjects simultaneously, custom timings, and real-time navigation dashboards. * **Results Analytics**: Instant scoring, detailed feedback on correct/incorrect choices, and direct textbook references for explanation. * **Review & Bookmark System**: Save difficult questions to study later, with optional notes and step-by-step review pathways. ### 2. PWA Offline Mode (IndexedDB Caching & Auto-Sync) Designed to operate reliably in low-connectivity areas across Nigeria: * **Subject Downloads**: Premium users can download complete subject question banks (up to 100 questions per subject) to practice entirely offline. * **Local Question Fallback**: Seamless fallback to client-side IndexedDB when network requests to Supabase fail or time out. * **Offline Result Queueing**: Saves exam session results locally if a student completes a test while offline. * **Auto-Sync Engine**: Registers a global listener on the browser's `online` event to automatically synchronize all queued offline sessions to Supabase once connection is restored. ### 3. Subscription Tiers & Feature Gating * **Free Plan Limits**: * Limited to 5 practice questions per subject daily. * Capt at practicing a maximum of 4 subjects total (new subjects remain locked). * Display of a dynamic countdown timer showing when the daily practice limits reset (resetting at UTC midnight). * **Locked & Blurred Premium Modules**: * **Locked Pages**: Navigating to *Full Exam Mo …