Solution 1:

These are the sets of qualifying/preliminary examinations of US universities that I collected some time ago for the same purposes as you. (Dave L. Renfro points out in a commentary below that he compiled a similar list a decade ago, the following includes new departments, updated old broken links and removes unavailable sources). These exams are of much help and some even include solutions!:

  • University of Arizona Ph. D. Qualifying Exams
  • Arizona State University Qualifying Examinations
  • University of Alabama Qualifying Exams.
  • University of Alabama at Birmingham Qualifying Exams
  • SUNY Albany Ph.D. Preliminary Examinations.
  • University of California-Berkeley Preliminary Examinations.
  • Boston University Preliminary Exams.
  • University of Colorado-Boulder Prelim Exams.
  • Columbia University Qualifying Exams.
  • University of Connecticut Prelim Exams.
  • University of California-Davis Exams.
  • University of California-Irvine Exams
  • University of California-Riverside Exams
  • University of Florida Graduate Exams.
  • University of Georgia-Athens Qualifying Exams.
  • Harvard University Qualifying Exams.
  • University of Illinois at Urbana-Champaign Comprehensive Exams.
  • Indiana University-Bloomington Tier I Examinations.
  • University of Iowa Qualifying Exams.
  • Iowa State University Qualifying Exams
  • Johns Hopkins University Qualifying Exams.
  • Kansas State University Qualifying Exams.
  • University of California-Los Angeles Qualifying Exams.
  • Louisiana State University Comprehensive Exams.
  • University of Maryland Qualifying Exams.
  • University of Massachussetts-Amherst Qualifying Exams.
  • University of Michigan-Ann Arbor Qualifying Review Examinations.
  • University of Minnesota Prelim Exams.
  • University of Missouri-Columbia Qualifying Exams.
  • University of Nebraska-Lincoln Qualifying Exams.
  • University of New Mexico Qualifying Exams.
  • University of North Carolina at Chapel Hill Comprehensive Ph.D. Exams (requires one to log in).
  • Northeastern University Qualifying Examinations.
  • Northwestern University Preliminary Examinations.
  • Ohio State University Qualifying Exams.
  • Oklahoma State University Comprehensive Exams.
  • University of Oklahoma Qualifying Exams.
  • Pennsylvania State University Qualifying Exams.
  • University of Pittsburgh Preliminary Exams.
  • Purdue University Qualifying Exams.
  • University of Rochester Preliminary Exams.
  • Rutgers University-New Brunswick Qualifying Exams and oral exams.
  • Stanford University Qualifying Exams.
  • Syracuse University Prelim and Qualifying Exams.
  • Temple University PhD. Exams.
  • University of Texas at Austin Preliminary Exams.
  • Texas A & M University Qualifying Examinations.
  • University of Utah Qualifying Examinations.
  • University of Washington Preliminary Examinations.
  • University of Wisconsin-Madison Qualifying Exams.

Solution 2:

Some old qualifying exams from Harvard: http://www.math.harvard.edu/quals/index.html

Solution 3:

Try the collection at Texas A&M University. Although I am not a student of the university, I used the collection to practice for my own qualifying exams. Here is the link: http://www.math.tamu.edu/graduate/phd/quals.html.