1. Causative structure: "A lot of classes end up being dull because teachers rely too heavily..." uses a clear cause-and-effect structure, which is great for explaining reasons in IELTS Speaking.
2. Present simple tense: The answer consistently uses present simple ("teachers rely," "lessons are repetitive," "students lose interest") to talk about general truths and habits, which is appropriate for this type of question.
3. Modal verb for suggestions: "teachers could try using..." uses the modal verb "could" to make polite and realistic suggestions, which is a strong feature in Part 3 answers.
4. Parallel structure: "games, group discussions, or even videos" is a good example of parallel structure, making the list of solutions clear and easy to follow.