1. Start Early: a 10% score improvement can takes 5 hours of coaching and perhaps 2 weeks to sink in. This is a test of skill, and training cannot be crammed. So many students start to study in the last 2-3 weeks, and they needlessly cap their scores far below potential. Give yourself a margin for error, and plan 2-3 months ahead.
2. Study the Questions: Real GMAT questions are profoundly complex and also rare. Don’t use them to practice basic ideas of grammar and math. Don't learn to drive by crashing a Ferrari into a tree.
3. Hire Many Experts: signing-up for a big package at a factory school is sub-optimal. Perhaps you've not been trained before, and now you are a first-time buyer of a big-ticket item. Take the time to shop around. Check out how the course is run. Who is teaching it. Have they taken the test? Why spend nearly $1,000 on a name you heard, when you've never even met the teacher? Why speak to just one teacher? Find your gurus!