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Kanishk RastogiNOVA's GMAT preparation book is a very useful guide for overall GMAT preparation. It has very good strategies for solving GMAT problems.
For Math section, the theory part is very solid with lot of examples and sample problems on each topic. It first teaches the theory, followed some relatively easy questions directly based on the preceding theory notes. It helps to practice those concepts. Then, there will be additional questions to practice the whole topic.