Thanks for your feedback. As I have suggested, you can visit the OALD for vocabulary, thesaurus.com for synonyms and antonyms and ozdic.com for collocations. Also, you can refer to such books as Check your vocabulary for IELTS, Cambridge Vocabulary for IELTS Advanced, English Collocations in use, Academic vocabulary in use, etc., most of which you can download from the Internet.
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IELTS Planet - Học IELTS online 2016
Công ty TNHH Vương Gia Đất Việt. Số ĐKKD 2901650769 do Sở KHĐT T. Nghệ An cấp ngày 29/11/2013. Địa chỉ: Số 10 Đường Nguyễn Phong Sắc, P. Hưng Dũng, Tp. Vinh, T. Nghệ An.