International School of San Antonio | 242 followers on LinkedIn. ISSA is a private language immersion school serving children in PreK3 through 5th grade. | The International School of San Antonio offers students comprehensive language immersion education from preschool through elementary school. We introduce children to rigorous global academic standards within a multicultural environment. Native-speaking teachers immerse students in Mandarin Chinese, French, or Spanish from the moment they walk through our doors.