Could you be a bit more specific as to what isn't working? So for example, say I select a question and then select edit choices. Are you saying that it isn't showing the data for the choices? If so, then that will be cause you need to get that data from the database using the ID you've passed through $_POST['edit_choices'].

On another note, there are also a few variable assignments to $_POST variables that have not been validated. This is generally a bad idea, but for simplicity, you could just ignore the error using @. Here are the ones I noticed:

1 near the top:

$submit_delete = @$_POST['delete'];

and these 3 near the bottom:

$submit_new_question = @$_POST['submit_new_question'];
$new_question = @$_POST['new_question'];
$edit_ID = @$_POST['selected_edit_q'];