Format of the GMAT Exam
The "low-hanging fruit" is a concept heard often in business circles, and it's a good one to use in any investment context. Low hanging fruit are easy to pick, so this idea is a simple guideline for maximizing return-on-investment, or ROI.
In a GMAT context, ROI is clearly improved by focusing on the section with the lowest percentile score. Most people do this intuitively, because they know if their english needs work, or if their math was always an issue.
But ROI is a concept that keeps on giving, and even when you know what section to study first, the question can still be asked, Which part of that section should I study first?