LInks to Great Exercises on Grammar Online

1. http://www.ego4u.com/en/cram-up/grammar
2. http://www.oup.com/elt/global/products/practicegrammar/
3. http://www.world-english.org/grammar.htm

There are so many websites on grammar on the internet. Above are just some of the samples.

Just try any one of them... remember: Practice makes perfect.