What does this say for the GMAT? The test has two categories: verbal and quantitative. 35% of Verbal questions fall into a category called 'Sentence Correction'

What does this say for the GMAT? The test has two categories: verbal and quantitative. 35% of Verbal questions fall into a category called 'Sentence Correction', which test grammar. Many correct answers to these questions are hotly-debated and often in contradiction to current style guides. Perhaps, there is some value in segmenting test-takers in their ability to learn and apply an arbitrary set of rules in place of their own. But, perhaps not.