Data Sufficiency questions in the GMAT CAT do not necessarily require you to calculate a specific mathematical answer; they require that you recognize if a specific problem could be answered using the information provided. These problems usually take less time than Problem Solving questions.

Data Sufficiency questions test your ability to analyze a problem, to recognize relevant or irrelevant information in determining the solution of that problem, and to determine when you have sufficient information to solve that problem.

Correctly answering these questions requires competence in high school arithmetic, algebra, and intuitive geometry. Mathematical insight and problem-solving skills are also necessary. No advanced mathematics is required.