Before you start

• 📋 30 questions in about 20 minutes (25-minute limit).
• 🤫 Find a quiet place. Take your time, but don't get stuck on one question: each has a time limit and you can skip.
• 🧠 Don't use a calculator, paper or outside help. That invalidates the estimate.
• 🎯 Before it counts, you'll do 2 practice questions with explanations.
• 💾 Your progress is saved on this device.
• 🎁 You see your result at the end, without paying.