There really is no "highest" area of study in math. There are innumerable ways of creating complexity in a mathematics. That is if you consider "greater complexity" to mean the same thing as "higher." Even expounding on something as "simple" as the number "1" or "0", there is a great deal of complexity that can be explored.
Mathematics can be considered a network of logical concepts where no particular hierarchy of concepts exists.
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There is no highest math. The Complexity can be infinite. There is also a ton of math that hasn't been discovered yet.
the highest number that a numerator increased by its GCF
280
For science, I don't know. But for math, Singapore is highest!
South Korea