Q: how to reset security questions answers forgot password to purchase games apps

You cannot reset your own Security Questions if you are in the process of needing to answer them in order to reset your password. You will need to contact Apple Support to have them reset them for you:

ACCOUNT SECURITY CONTACT NUMBERS

Cheers,

GB

You need to ask Apple to reset your security questions. To do this, click here and pick a method; if that page doesn't list one for your country or you're unable to call, fill out and submit this form.

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