I am currently holding a Preliminary Single Subject Teaching Credential in Mathematics. I got my teacher training in Hong Kong. I don't know if I am required to take the CTEL exam. Do I need to have the CLAD certificate in order to teach in California??? What does English Learners mean? Does every teacher teach in California need to take the CTEL exam??? If I need to take the CTEL, can you suggest me what study guide I should buy? Is it a difficult exam? Thank you for answering my questions.