Difference Between Continue and Review

While the Continue button takes you to the next unanswered question, the Review button takes you to the next relevant question in sequence whether answered or not.

To toggle between Continue and Review, click the arrow to the right of the Continue/Review button and select the desired mode.

Here are simple rules on when to use Continue and when to use Review:

Important!  If you are in Review mode and land on a Repeat Control Question, and want to Add an answer at that question, you need to temporarily switch back to the Continue mode first, add your answer and then switch back to Review mode to continue reviewing your answers.