Hello,
Welcome to Apple Support Communities!
This link may help you solve your problem:
If you forgot the answers to your Apple ID security questions - Apple Support
- Go to iforgot.apple.com.
- Enter your Apple ID, then select Continue.
- Choose the option to reset your security questions, then select Continue.

- Enter your Apple ID password, then select Continue.
- Follow the onscreen steps to verify your identity. If you don't get any options to verify your identity, you can't reset your security questions at this time.
- Choose new security questions and answers and select Continue. See our tips for choosing security questions and keeping your account secure.

After you reset your security questions, you might want to set up two-factor authentication instead. It's the best way to keep your account secure, and you won't need to remember any security questions. You can set up two-factor authentication right from your iPhone, iPad, or iPod touch with iOS 9 or later or your Mac with OS X El Capitan or later.
-Apple Support
-TechGEEEK