STT Tên tài liệu
1 Tài liệu – Progressive Skills Listening and Speaking – level 4 – B2 – IELTS 5.5-6.0
2 Tài liệu – Progressive Skills Listening and Speaking – level 3 – B2 – IELTS 5.0-5.5
3 Tài liệu – Progressive Skills Listening and Speaking – level 2 – B1 – IELTS 4.5-5.0
4 Tài liệu – Progressive Skills Listening and Speaking – level 1 – B1 – IELTS 4.0-4.5