Practice makes perfect!
These links take you to a huge variety of online educational games.
For practice at alphabetical order:
http://www.primaryresources.co.uk/online/alphaorder1.swf
http://www.lethsd.ab.ca/mmh/games/top100.htm
http://www.surfnetkids.com/games/
http://www.scholastic.com/kids/games.htm
http://teachingtreasures.com.au/educational-games.html