Is studying past exams I found online cheating?
This is from the Texas A&amp;M Honor System:

20.1.2.3.6 Complicity:
Intentionally or knowingly helping, or attempting to help, another to commit an act of academic dishonesty. Examples: ...
b. Distributing test questions or substantive information about the test without the instructor’s permission.

If you were here at Texas A&amp;M, then this is considered an act of academic dishonesty (in my interpretation), as this was uploaded to the repository, perhaps without the knowledge of the instructor (as is usually the case). If, on the other hand, the instructor had provided old exams or released sample tests, then this is okay. I personally follow this, as I only trust information from the instructor.
However, I would say this was a lucky search on your end. Unless your campus has a clause on academic conduct and the distribution of past tests, you're okay.
This answer was based on a misinterpretation of the question and is therefore not a valid one. The original text is still available.