You can add another switch case.
Example:
<p ng-switch="status">
<span ng-switch-when="wrong">
Wrong
</span>
<span ng-switch-when="incorrect">
Wrong
</span>
<span ng-switch-default>
Correct
</span>
</p>
Live example: http://jsfiddle.net/choroshin/Zt2qE/2/