How FOURI.IN AI Works: From Question Paper to Mock Test in Minutes
Discover the technology behind FOURI.IN — how OCR, AI analysis, and smart algorithms transform your uploaded question papers into interactive mock tests with detailed performance analytics.
How FOURI.IN AI Works: From Question Paper to Mock Test in Minutes
Have you ever wondered what happens after you upload a question paper on FOURI.IN? Behind the simple drag-and-drop interface lies a sophisticated AI pipeline that processes, analyzes, and transforms your paper into a fully interactive mock test. Here is a behind-the-scenes look at the technology powering FOURI.IN.
Step 1: Secure File Upload
When you upload a question paper (PDF, JPG, or PNG), the file is securely transmitted to our backend. We use Telegram Bot API channels for reliable, scalable file storage with built-in CDN support. Your files are encrypted during transit using HTTPS/TLS and stored securely.
Step 2: OCR Text Extraction
Our OCR engine, powered by Tesseract.js, extracts text from your uploaded images and PDFs. Tesseract.js supports multiple languages including English, Hindi, and Bengali — making it ideal for Indian exam papers. The OCR engine handles printed text with 98%+ accuracy and can even process handwritten content. We use preprocessing techniques like contrast enhancement and skew correction to improve extraction quality.
Step 3: AI Question Analysis
The extracted text is sent to our AI engine (GPT-4o-mini via OpenRouter). The AI performs several critical tasks:
- Identifies individual questions from the text
- Detects question type — MCQ (Multiple Choice) or Subjective
- Extracts options for MCQ questions
- Identifies correct answers where provided
- Categorizes questions by subject and difficulty
- Generates a title and duration for the mock test
The AI processes up to 65,000 tokens per analysis, allowing it to handle even the largest question papers with 100+ questions.
Step 4: Mock Test Generation
The analyzed data is structured into a complete mock test with:
- A countdown timer that you can customize before starting
- Interactive question cards with option selection
- A question palette showing answered, marked, and unanswered questions
- Auto-save functionality — your answers are saved every few seconds
- Tab switch and window blur detection for exam integrity
Step 5: Smart Evaluation & Analytics
After you submit your test, FOURI.IN evaluates your answers using a combination of exact matching for MCQs and AI-powered semantic matching for subjective answers. You receive:
- Overall score and accuracy percentage
- Subject-wise performance breakdowns
- Per-question AI explanations
- Ability to re-evaluate subjective answers
All of this happens in minutes, not hours. Try it yourself at FOURI.IN — completely free for all students.