There used to be a collection of practice exams for the Missouri S&T Mathematics Placement Test at the site braintrax.mst.edu, but they were taken down between February and July 2019. The site archive.org makes them available.

Algebra Exams: https://web.archive.org/web/20100610161501/http://braintrax.mst.edu/math/algebra/visitoralgebraexams.htm

Trigonometry Exams: https://web.archive.org/web/20100610161501/http://braintrax.mst.edu/math/trig/visitortrigexams.htm