Advanced grammar in use: a self-study reference and practice book for advanced learners of English by Martin Hewings. (PE1112 .H48 2005)

Collins COBUILD student's grammar : self-study edition with answer key / practice material by Dave Willis. (PE1112 .C63)  

Common English errors in Hong Kong by David Bunton. (PE1130.C4 B86)

Communicate what you mean: a concise advanced grammar by Carroll Washington Pollock. (PE1128 .P584 1997)

Excellent online resource including rules, examples, exercises, quizzes.

A mix of free grammar exercises.

Grammar resource suggestions for students preparing for CRE.

Advanced language practice : English grammar and vocabulary by Michael Vince with Peter Sunderland  (PE1112 .V56 2003)

400 must-have words for the TOEFL [e-resource ] by Lynn Stafford-Yilmaz, Lawrence J. Zwier

1,000 most important words   by Norman W. Schur  (PE1449 .S45 1982)

Paul Nation & & Batia Laufer's Level Word Tests

Vocabulary guide and exercises for students in higher education

Pronunciation

http://www.edict.com.hk/vlc/pronunciation/

http://www.btinternet.com/~eptotd/vm/vowelmachine/vowelmachine.htm

http://international.ouc.bc.ca/Pronunciation/

http://www.soundsofenglish.org

http://accent.gmu.edu/

http://lc.ust.hk/~material/pl/index2.html

Grammar

Improving Your Grammar

Learning Strategies and Tools for Improving Your Grammar

Resource Guide: Common Grammar Errors

Vocabulary
Building Your Vocabulary

Resource Guide: Vocabulary

Pronunciation

Improving Your Pronunciation

Resource Guide: Pronunciation

Resource Guide: Speaking Fluency

Focus on Grammar . An advanced course for reference and practice by Jay Maurer CD-ROM (PE1128 .M3547 1996)

REACTIONS                                                                                                   
Builds vocabulary through reading and exercises

Brush up your English: a useful series of online exercises from HKU made with HK learners in mind.

UnivSource.com Vocabulary Builder

Vocabulary Simple System