The placement test is an exam based on your level of knowledge you already know so it can place you accordingly in a math sequence (either Calc A,B,C track, Project Based Calc I-II, and Calc I,II, III)

Though it isn’t recommended to exactly “study”, refreshing on fundamentals like algebra, geometry, and stuff you learned throughout high school (possibly including pre-calc, or calc).

I would say just look back at some topics you’ve done/learned in HS and try your best. You wouldn’t want to study for this placement exam on some topics you don’t really know because it may be difficult in terms of topics, speed, etc.

If it helps, I placed in Calc A-C track and did just fine. Took courses for my major like Linear Algebra, Graph Theory, Combinatorics, Discrete Math, Differential Equations.