What are some ways to evaluate someone's intelligence?

Can You Solve Real-Life Problems?
Intelligent people are good at solving real-life problems. Real-life problems are quite different from textbook problems, where the right answer is already known and every problem is simplified to a mathematical problem. In real world, no situation is ever the same. Even when the problem is the same, the people and situations are different. Hence, you have to be really intelligent to find solutions to real-life problems, which are always unique and whose accuracy is known only in the future.