Hi Adriana,
It's too early to be frustrated, so don't lose confidence! 10 minutes per passage is good timing to work with. During the actual exam, try not to look at the clock too often - remember, the faster passages will even out with the ones that take more time. Also, a difficult part of writing full-length exams is maintaining focus and stamina for the whole thing, which can affect your timing. So, practice the 101 passages as full-length (70 minutes) tests to get used to this.
I hope this helps!
Meaghan