i am looking at curriculum for next year. I don't have much money to spend. I need a curriculum plan for 3 kids ages 13, 10, and 7. The thing is I am a person who needs lesson plans already written out for me. I was considering my father's world but it only seems to have geography and a little science. I need one that also has science and math and language arts in it. I was looking at eBay which seems to be cheaper. Can anyone who has multiple kids tell me how they taught multiple children for not much money? Or is that possible?