Selling this set of 8 Manhattan GMAT Strategy guides. Bought this last year for GMAT prep. It is a must have if you are planning to take the GMAT. Here's the description of the guides:

The 8 Manhattan GMAT Strategy Guides (5 Quantitative, 3 Verbal) are the heart of our curriculum. Our 5 Quantitative Strategy Guides provide in-depth instruction in the GMAT’s principal quantitative content areas: Number Properties, Fractions, Decimals, & Percents, Word Translations, Equations, Inequalities, & VIC’s, and Geometry. Our 3 Verbal Strategy Guides provide in-depth instruction in the GMAT’s principal verbal content areas: Sentence Correction, Critical Reasoning, and Reading Comprehension. Included in this set are: The Critical Reasoning Guide (200 pages; ISBN: 0-9824238-0-2); The Equations, Inequalities, & VICs Guide (192 pages; ISBN: 0-9824238-1-0); The Fractions, Decimals, & Percents Guide (112 pages; ISBN: 0-9824238-2-9); The Geometry Guide (112 pages; ISBN: 0-9824238-3-7); The Number Properties Guide (160 pages; ISBN: 0-9824238-4-5); The Reading Comprehension Guide (152 pages; ISBN: 0-9824238-5-3); The Sentence Correction Guide (288 pages; ISBN: 0-9824238-6-1); The Word Translations Guide (176 pages; ISBN: 0-9824238-7-X).

The content of this set is aligned to the latest Official Guides from GMAC (12th edition).