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About Mark
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.
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