A composite ACT score of 23 is usually high enough to allow for admittance to many major universities, although it may not be high enough for admittance to an Ivy League university that relies heavily on standardized test scores. The composite score is an average of all the ACT assessment subsections.
The ACT tests math, science, reading, English and writing. Colleges and universities have different admission requirements, so it is best to check with prospective colleges to determine if 23 is a good score.
For example, the University of Florida requires a score of 19 for math, 19 for reading and 18 for English and writing combined. That averages out to a score of 18, making a composite score of 23 a good score for applying to that university.