You need to review the first 89 questions before taking a break and you are not able to return to that section after the break.
Sadly that was one of the reason I didn't pass my exam as I was caught by surprise with this until I bumped into this forum. I thought I could just skip my breaks and review all of them later, but noooo...
Think need to have a better strategy in time management for the exam and by 89th questions and having 120 minutes left, I was hoping I could rush the entire questions first before reviewing them. Sigh! Didnt know PMI came out with this. By the time I was finished with 200 questions, I have 10 minutes left to review but too bad couldn't return to the first 89th questions.