My girls are in 6th & 9th grades.We have used the Ambleside online which is a free curriculum. Some of the books are online the rest you will have to buy used online. You might try An old fashioned education which is also a free curriculum, All of the books are online. All you have to do is print out the chapters they will read this week.Ambleside online is set up the way C.M. would have done it. The higher levels are challenging , my oldest likes the challenge.My youngest likes an old fashioned education instead. Take a look at both and see what which one your kids would love. Ruth