If you accidentally select an answer, you can easily Reset your selection in both the desktop version of AMBOSS and the mobile apps. By reversing this action, your mistake will not be reflected in your statistics. Here’s how:
After selecting an answer in the desktop version of AMBOSS, click on Reset Question at the bottom right corner of the question window.
Open the Options window (look for three small vertical dots in the bottom right corner). Then select Undo.