Online GMAT tutoring: learn where Data Sufficiency fits

Data Sufficiency can be a useful topic for a GMAT lesson, but it is not automatically every learner’s first priority. Start with the section evidence from your baseline, then choose a skill that needs attention.

Separate Quant from Data Insights

In the current GMAT, Quantitative Reasoning contains Problem Solving. Data Sufficiency belongs in Data Insights alongside four other question formats. The 21-question Quant section should not be described as a mixture of Problem Solving and Data Sufficiency.

Original example: test each statement before finding the product

For positive real numbers x and y, what is xy?
Statement 1: x + y = 10.
Statement 2: x = y.

Statement 1 alone is insufficient: x = 1, y = 9 gives 9, while x = 5, y = 5 gives 25. Statement 2 alone is insufficient: equal values could both be 1 or both be 5, giving different products.

Together, 2x = 10, so x = y = 5 and xy = 25. Both statements together are sufficient, but neither alone is sufficient, conventionally answer C. Check the answer mapping supplied with any exercise.

Testing each statement separately prevents information from the first from silently entering the second. Calculation is useful here because it supplies concrete counterexamples.

What to ask an online tutor

Ask the tutor to identify which assumption caused an error, then provide a new question testing the same distinction. Discuss your target programmes, practice baseline and time zone rather than choosing a plan from a score slogan.

Use the official starter kit for current-format practice and the free study planner to reserve review time. See GMAT tutoring for the service, including the terms to confirm before booking.