Guidance counselors, generally, are the best source of information about school testing programs. Some schools put all test scores on transcripts. Some transcripts have no standardized test score labels on them. It is also important to find out what procedure is required by the colleges for having test scores submitted as part of the admissions process. Most colleges will take either the ACT or the SAT - this must be checked individually with each school.
Colleges can base merit aid awards partially on standardized test scores.
Some colleges can and do use these tests for course placement.