Which country was best in math?

Could you please clarify the context of this question? Are we referring to a specific competition, an annual ranking, or perhaps a study that compares the math abilities of students across different countries? Without this information, it's difficult to provide a precise answer. However, if we're talking about international math competitions or rankings, several countries often stand out for their strong performance in mathematics. These might include countries like China, Singapore, South Korea, and others that have invested heavily in education and mathematics curricula. It's worth noting that these rankings can vary depending on the specific criteria and methodology used in the evaluation.