How do the 170 question Mock Exams work?

Hello. Before I start to take the 170 mock practice exams, I have a few questions that I hope you all could answer. Are both of the 170 question TIA mock exams (1 and 2) the same? Are they unlimited during my 3 months that I purchased? I purchased the TIA Stimulator and Study Hall exams, but I am not sure how they work. If anyone can help explain how they work, I'd greatly appreciate it.

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