Is GMAT Official Guide enough?

Related questions

1. When should I take the GMAT for fall 2020?
2. Which exam is tough CAT or GMAT?
3. Do I have to take the GMAT for an MBA?
4. Which is better to take GMAT or GRE?
5. Is GMAT necessary for MBA?
6. How good is a 700 GMAT score?
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