There are several highly effective English-speaking courses available for students that cater to their specific learning needs and preferences. Some of the top options include:

1. Duolingo: Duolingo is a popular platform offering interactive language lessons that are engaging and effective for students.

2. Rosetta Stone: Rosetta Stone provides immersive language learning experiences that are well-suited for students looking to improve their English language skills.

3. EF Education First: EF offers a variety of English courses that are designed specifically for students, focusing on conversational skills, grammar, vocabulary, and more.

4. British Council: The British Council offers high-quality English language courses designed for students of all levels, with a focus on communication and practical skills.

5. ESL programs at universities: Many universities offer English as a Second Language (ESL) programs that are tailored to students’ needs, providing a comprehensive learning experience.

These courses provide a structured curriculum, interactive learning materials, and opportunities for practice and feedback, making them effective options for students looking to enhance their English-speaking skills. Students can choose the course that best fits their learning style and level of proficiency to make significant progress in their language learning journey.