Many excellent resources are made available through the state of Michigan on the the Michigan Electronic Library site.
Includes preparation materials and interactive practice exams for numerous standardized tests such as MEAP, GED, SAT, and GRE. Also includes tests for professions such as law enforcement and real estate. The Job & Career Accelerator tool provides step-by-step job search assistance. This free service does require that you register a username or email address. Michigan residents can access this database from the Michigan eLibrary by logging on with a Michigan ID or driver's license number.
Several subject research guides from WMU Libraries also include a tab for career information in that field. So you should also check the subject guide for yor major to see if there are specific resources related to careers in that field.