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The GMAT is an admissions test for business schools, most of them outside India, and it is unusual among the exams Indian candidates prepare for: almost none of it is new material. The maths sits at about school level — arithmetic, algebra, ratios, word problems — and the difficulty is in reading the question correctly and finishing inside the time.
It is also computer-adaptive and taken by appointment through the year rather than on a fixed national date. There is no exam season, and no batch of classmates sitting the same paper on the same morning. Most candidates are preparing alone, usually after office hours, against an application deadline rather than a school timetable.
Which is why the brief for a tutor here is normally half the paper rather than all of it: quantitative speed for someone who has not done timed maths in several years, or verbal reasoning and reading comprehension for someone already comfortable with the numbers. The scheduling matters as much as the teaching. A working candidate cannot always make a fixed weekend batch, and one-to-one can move.