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.