Are topic questions similar to mock exams?

I finished all the topic questions from the CFAI website last week and I am attempting a timed mock exam. I noticed questions are the same verbatim and was wondering if i should even go through with it.

Past year’s mock questions will indeed be the same as the Topic Test questions that are available this year. The mocks pull item sets from the topic tests each year, weighted in a way that mirrors the exam topic weights. However, for the current year’s mock (2017) they remove those item sets from the Topic Tests (for obvious reasons) so they’ll be different.

Going through all the Topic Tests is basically the same as doing a bunch of prior year mock exams.