Learning confidential information with Anki

When learning confidential information, u can still use Anki desktop offline. Type the question into front card of Anki, then type the answer index number into back card of Anki, then when practising, look for the index no. corresponding to the index number on the physical answer sheet that contain the confidential information. A better way, is to use one page of the notebook for one answer for quick locating, and prevent peeping at other answers.