Change security questions

As per this article https://support.apple.com/en-in/HT201303

Employee privacy and security policies

In addition to strong passwords, encryption, and other technology, Apple has strict policies and procedures in place to prevent unauthorized access to your account. Without proof of your identity via security questions and other carefully selected criteria, Apple Support can't help you reset a password or perform any other actions on your account. These policies are audited and reviewed on a regular basis.

you need answers for resetting the questions , contact apple support see this link https://support.apple.com/en-in/HT201232

You need to contact Apple's Account Security team. To reach them, click here and pick a method; if you can't use any of the ones listed, fill out and submit this form.

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