Correct the mistakes in these sentences.

1. In the UK, students between 16 and 18 can go to a [sixth-form college]. 2. The school-leaving age is 18 in many countries. 3. I’m glad you succeeded in your exam. 4. She has to sit a Biology exam next week. 5. Is school compulsory till 18 in your country? 6. Do we have to submit our work to the teacher by Friday? 7. I’ve made a lot of progress in my English recently. 8. Thanks to the LMS, teachers can mentor their students’ activities.