Greg's practice questions vs Big book in limited time?

Hi,
i have memmorized quant foundations and attempted all prepswift exercises and tick boxes tests at a 90%+ accuracy untimed.
I have 22 days remaining for my test, and i am planning to reinforce my strategies untimed and timed using gregmat practice quant questions instead of Big book, as former have solution explanations by greg.

What do you suggest, should i go with this plan or should i stick to big book?

I would start with big book first with timed practice, then move on to Greg’s once you’ve proven you’re very good at those

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