Welcome to California International Online School’s official website. We are currently working on creating and offering various online educational options for English Learners based in the United States of America and throughout the world. We have shared educational activities for English Learners via our CAINTOS Facebook Page for several years and offer even more support. We plan to officially open a private, online school for American English Learners worldwide.
Official Announcement:
“California International Online School, a private online American English Language school, will open at the beginning of 2024. It will offer a low-cost, comprehensive, multi-level English language literacy program for international English Learners. California International Online School will offer initial English language-level testing, online courses, weekly online office hours for student check-ins and support, three monthly webinars, and participation certificates.”

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Stay tuned for more news on this page. Until then, here’s what we currently offer:
Hello everyone,
If you’ve ever wanted to learn English with an American English teacher, here is your chance. Ioan Elvis Sersea, M.A., M.A.T., aka Maestro Sersea, offers numerous free online resources for learning American English for English learners worldwide.
Learning American English is now possible regardless of students’ geographical location or financial ability. Maestro Sersea offers free and low-cost educational resources for English Learners everywhere. Whether you wish to improve your English listening, reading, speaking, or writing skills, our educational resources below can help you succeed.
Click below to access our variety of English Learning resources: