How many straight A students are there all over the world?

It's impossible to know exactly how many students worldwide achieve straight A's. There's no central, global database tracking student grades. The number would vary wildly depending on:

* Definition of "straight A's": Grading systems differ across countries and even schools within countries. Some use letter grades (A, B, C, etc.), others use numerical scores, and the thresholds for each grade vary.

* Level of education: Are we talking primary school, secondary school, university, or all levels combined?

* Definition of "student": Does this include all students enrolled in formal education, or only those considered full-time?

Even within a single country, collecting this data would be a massive undertaking. Therefore, any number given would be pure speculation.