Students have to take math entrance exams. If they get below certain grades in the test they may be required to take remedial math classes. Students will ask for where they can study for the exams. These are some links:
Study Guide (examples) https://secure-media.collegeboard.org/digitalServices/pdf/accuplacer/accuplacer-sample-questions-for-students.pdf
Accuplacer Practice Quizzes http://academics.utep.edu/Default.aspx?tabid=25191
Get the App! Android & Mac https://store.collegeboard.org/sto/productdetail.do?Itemkey=120095191
Basic Math Accuplacer Practice Quiz
Intermediate Math (Part 1) Accuplacer Practice Quiz
Intermediate Math (Part 2) Accuplacer Practice Quiz
College Math Accuplacer Practice Quiz http://academics.utep.edu/Default.aspx?tabid=25202
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College Board Accuplacer Intro - Good general overview: http://www.collegeboard.com/student/testing/accuplacer
CT Community College Math Review for Accuplacer tests: http://www.nv3.commnet.edu/bcaserta/mathreview/
Prepairing for Accuplacer Math Exams - the left navigation expands to show lots of resources: http://www.accuplacermath.project.mnscu.edu/index.asp?Type=NONE&SEC={49D0F901-C7FE-4574-95A9-AA78031D4D6C}
Virtual Math Lab - http://www.wtamu.edu/academic/anns/mps/math/mathlab/thea/math_help.htm
Accuplacer Text Success - http://www.accuplacer-test.com/accuplacer-math-free-sample-questions.htm
Aims Community College - Testing Center Accuplacer Study Guides http://www.aims.edu/student/assessment/studyguides/
West Texas A&M Accuplacer & Math Study Session: http://www.wtamu.edu/academic/anns/mps/math/mathlab/thea/index.htm
There are lots of free resources, Some places will give some free and then tease you to buy - which is ok, if the free is good.
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SAT at Khan Academy https://www.khanacademy.org/sat?utm_source=Sailthru&utm_medium=email&utm_term=All%20Teachers&utm_campaign=SAT%20Launch%20-%20Teachers