Science
Physics - http://physicsworld.com/
Chemistry - http://chemistry.about.com/
Biology - http://www.biology-online.org/
Gen. Sci. - http://www.factmonster.com/ipka/A0772964.html
Math
Trigonometry - http://www.sosmath.com/trig/trig.html
English
Reading - http://www.rhlschool.com/reading.htm
Grammar - http://grammar.ccc.commnet.edu/grammar/
Filipino
Panitikan - http://panitikan.com.ph/index.htm