http://www.noetic-learning.com/mathdrill
http://www.freemathtest.com/math-Addition.asp
http://www.freemathtest.com/Default.asp
http://free-english-study.com/grammar/present-simple.htm
http://yourchildlearns.com
http://www.english-test.net/esl/learn/english/grammar/ei107/esl-test.php
http://a4esl.org/q/f/z/zz91mgj.htm
http://www.elllo.org/english/Games.htm
http://www.hgs.u92.k12.me.us/elementary.htm
http://www.netrover.com/~kingskid/double.htm
http://www.mightybook.com/alexi_and_pexi.html
http://www.englishjet.com/english_courses_files/test_level.asp
http://www.bbc.co.uk/cbbc/create