When it comes to books, it really is a jungle out there!
There are many great books. On the linked pages, you’ll find our special recommendations for improving your grammar, vocabulary and punctuation. There's a selection of useful dictionaries as well as some useful books if you're heading for the IELTS exam.
In addition, there are excellent exam preparation materials with CDs and audio tapes available, especially useful if you are heading for the IELTS or TOEFL examinations.