Seeking free or low-cost CRM for adult education program

Hi. I'm starting up an adult education program for a small school system. I'd like to track all my contacts, teaching locations, instructors and associated documents, outreach, and even registration. The school system uses Google Workspace, so an add-in for that ecosystem could work. Can anyone recommend a low-cost or free-to-non-profit CRM they have used that could meet my needs? TIA for any suggestions.