Revision

For grammar exercises check here: http://del.icio.us/teooria/grammar
you will find links to exercises in Gerund, Infinitive, Participle, Conditionals, Modals as well as Emphasis and inversion.

Here you can also find good exercises for revision on different topics:
http://www.usingenglish.com/quizzes/

Do the exercises in the areas you feel you need to practice and leave a comment as to which exercises you did and on which page (you can also provide the result if you want but it's not obligatory).