The GMAT does look at your spelling.
The standard recommendation is to use the American English since that's where GMAT is from and will be the safest bet. However, I think British is passable and not considered wrong since that's the "original."
The standard recommendation is to use the American English since that's where GMAT is from and will be the safest bet. However, I think British is passable and not considered wrong since that's the "original."
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