Manhattan exams: if you buy any book you will have a code with access to 6 exams (I only did one and found very difficult the Quantitative section, but maybe this was compensated lately at the final score… one option may be practicing with these a lot to be prepared for a high level of difficulty in Maths.
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More: "All I wish someone had told me about GMAT beforehand"
There are many things you want to know before doing the GMAT exam (how is exam day, what to expect, how to think, to do's...), and you have them in this blog, in a simple way