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MARK WAHL is owner and director of Mark Wahl Learning Services in Washington State near Seattle. He has been both a mathematics learning specialist since the 70’s and a test preparation specialist since 1986. He is also an author of 4 books for teachers and a professional development trainer of many hundreds of grade school and high school teachers. Also, thousands of potential grad students have met their GRE goals thanks to Mark's thoughtful instruction. Learn More>>>