* He didn't like the words: Maybe the words were boring or too easy. He might have wanted a challenge.
* He felt rushed: He might have been stressed about the test, even if he knew the answers, and that took away from his enjoyment.
* He doesn't like tests in general: Perhaps Igor finds tests stressful or dislikes the idea of being graded.
* He was comparing himself to others: Even if he did well, maybe he thought his friends would do even better.
To help you solve this, tell me more! What is the context of the story?
Do you have any other clues about Igor's personality or how he feels about school? Let's figure out why he's unhappy!