One of the benefits of College Board releasing a new practice exam is it gives students a chance to get accustomed to the new numbering this year…
When students work on the multiple choice, there is a transition between the section where they select one answer per question vs the section they select two answers per question. The numbering skips from problem 66 to 131.
Students should be careful not to just continue bubbling (onto 67, 68, etc.) Instead, they must stop bubbling on that page and continue near the bottom of the next page, starting at problem 131.
You can see it in the new 2018 practice exam (in your AP Audit account, in the secure materials section).