Sources that I can use for TOEFL preparation

Hello!
I hope you all are well. I will be preparing for the TOEFL exam short and I want to know the credible sources that I can use for the preparation.
Which books should I buy?
Plus I will be using Greg platform (videos) for preparation.
Thanks for the help that you can provide!

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Buy just one book out of three official books and that should be more than good enough, imo.

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