The flagged questions should be visible in the navigation - there should be a little red triangle at the top right of the [1] button in the above example.
The flagged questions are also indicated on the summary page that you go to before submitting the quiz.
Quiz
New feature for Moodle 2.0 - flagging questions during an attempt
Arutelu on lukustatud, seetõttu ei saa te sellele enam vastata.