You may be in Private Browsing mode.
To check and change the browsing mode, do the following:
- Press the Home button to hide Safari.
- Go to the Settings app and tap it.
- Tap Safari.
- Check if Private Browsing is on or off.
- If it's ON, set it to OFF. Select Keep All if you are prompted to Close All Tabs.
- Press the Home button to hide Settings.
- Tap Safari to return to the Q&A. You should now be able to tap Practice or Assessment to display either one.
- If the above does not resolve the issue, try the Google Chrome browser.