Taking practice tests for the SAT and ACT are a great way to prepare, but they can be really expensive. Did you know that you can take a practice test online anytime for free using the Testing & Education Reference Center? All you’ll need is your Charlotte Mecklenburg Library card number or your Charlotte Mecklenburg School (CMS) ID number. To access, simply visit our website, and click on Resources for a full list of available content. Click on Testing & Education Reference Center and create a free account using your library card or CMS student ID number.