You can revisit a mock test any time and any number of times, after you have taken it. For revisiting a mock test, click on Performance against that mock test. In the next widow, click on ‘Doubt Clearance’. In default all the questions in the mock tests would be shown. If you wish to revisit only wrongly attempted questions, change the selection in the dropdown from ‘All Questions’, to ‘Wrongly Attempted Questions’. If you want to revisit only unattempted questions, you can choose ‘Unattempted Questions’ from the dropdown list.