crack OAT vs OAT destroyer? QR section vs MATH destroyer?

[sndp]

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Can anyone who has done the OAT tell me which material was more effective? Crack the OAT or OAT Destroyer? I heard the Destroyer was a lot harder than the actual test..

Also is the QR section of the OAT destroyer as good as the MATH Destroyer?
I cant really afford all of them, trying to see which option is best.
Thank you