🚀 A production-ready CBT system used to conduct nationwide exams across Nigeria — built for low-connectivity environments.
This project demonstrates the deployment of a scalable Computer-Based Testing (CBT) system designed to operate reliably in environments with limited or unstable internet access.
Successfully deployed and managed a large-scale CBT examination for Pharmacy Technician candidates across all 36 states in Nigeria.
Conducting nationwide CBT exams in Nigeria presents several constraints:
- Unstable or unavailable internet connectivity
- Risk of exam disruption during live sessions
- Difficulty in collecting results centrally
- Infrastructure limitations across multiple locations
The system was designed with an offline-first architecture:
- Each CBT center runs exams on a local Moodle server (LAN-based)
- No internet required during the exam
- Results are stored locally during the session
- A custom plugin (SendResults) handles synchronization
Once internet becomes available:
- Results are securely transmitted to a central server
- Data is aggregated for nationwide processing
- 🖥️ Offline CBT delivery across multiple centers
- 🔄 Centralized result synchronization
- 📤 CSV + JSON result export
- 📧 Email-based result delivery
- 🔐 Controlled access for CBT administrators
- 🌐 Retry mechanism for unstable internet connections
- Moodle 4.4 (Customized)
- PHP (Plugin Development)
- MariaDB
- Apache Server
- Redis
- JavaScript
A custom-built Moodle plugin responsible for:
- Generating CSV and JSON result files
- Sending results to a central API endpoint
- Handling retries in case of network failure
- Emailing results automatically
- Identifying each CBT center via server naming
┌────────────────────┐
│ Student Devices │
└─────────┬──────────┘
│
(LAN Network)
│
┌─────────▼──────────┐
│ Moodle CBT Server │
│ (Local Deployment) │
└─────────┬──────────┘
│
┌─────────▼──────────┐
│ SendResults Plugin│
└─────────┬──────────┘
│
Internet (When Available)
│
┌─────────▼──────────┐
│ Central Server │
└─────────┬──────────┘
│
┌─────────▼──────────┐
│ Email / Database │
└────────────────────┘
- ✅ Successfully conducted exams across all 36 states
- ✅ Eliminated dependency on real-time internet
- ✅ Ensured zero disruption during exams
- ✅ Enabled reliable nationwide result aggregation
This project addresses real infrastructure challenges in large-scale digital examinations, particularly in regions with unreliable connectivity.
It proves that robust, scalable CBT systems can be deployed without requiring constant internet access.
- LinkedIn: https://www.linkedin.com/in/lusasms/
- Email: ndagba4me@gmail.com
🚀 Open to collaborations and remote opportunities