The same high-quality questions are used in both versions of the quiz.
In Practice Mode, you have the option to view the correct answer and answer rationale for each question right away as you take the question. Your results will not become part of your Confidence Dashboard score.
In Graded Mode, you will need to submit the quiz before viewing the correct answers and rationale. Your results will also be available in the Quiz Results progress page and will become part of your Confidence Dashboard score.