For teachers and others- What are the things kids learn in every grade?

What from grade 1- or w.e to grade 12 or 8 or 9 w.e do they learn, like in there grade what do they learn? someone told me to go to the world book encyclopedia but i can't get it to tell me, PLEASE help i really need to move on, and i can't if i don't know WHAT i need to learn. so plzzzz help me.<3