Charles Bibilos

Founder at GMAT Ninja

Charles Bibilos is the founder of GMAT Ninja, an online test prep tutoring service specializing in graduate entrance exams. With more than 20 years of hands-on tutoring experience, Charles has guided students through every phase of graduate admissions, witnessing many changes in testing and admissions trends along the way. In addition to his work as a tutor, Charles' MBA consulting services have helped hundreds of students gain admission to top business and management programs around the globe.

Articles by Charles Bibilos

Abstract 3-D illustration of a raceway with pencils scattered across the tracks

Master reading accuracy with 5 expert test strategies

Discover actionable reading and math strategies to avoid mistakes and improve test accuracy.

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Beat GRE quant traps using expert-tested shortcuts

Unlock GRE quant shortcuts, flexible tactics, and diagnostic tips for faster, more accurate scores.

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Break free from GRE vocabulary myths for real score gains

Discover why strong process, not memorized vocab, drives GRE verbal success. Learn expert strategies to study smarter.

A 3-d illustration of a man in a business suit opening up a safe with three bricks displaying different test scores (600, 700, and 750)

Unlocking test score secrets for MBA admissions

Learn how psychological score thresholds, test options, and strategic exam choices can boost your business school application.