Need to start over, any suggestions welcome

Hello! It’s been awhile… we’ve had a roller coaster ride for the last 3 years. Too long to elaborate; but,  I know we need to come back to SCM for my two daughters.  I’m most concerned for my oldest (15, almost 16, approx. 10th grade).  since we left a small co op she attended for 1 and 1/2 years. We figured, by this age she was old enough to keep up with her assignments, organize her work, meet deadlines etc.  Not so.  She got so behind… We pulled out of this group after Christmas break, and since then we’ve been floundering.  We finished her A beka Health book, and what few lessons were left in her Wordly Wise book.  I’ve started her next Math U See; and she attended a kind of, laid back co op one day a week that taught Speech, Economics, Sign Language, and a Myth Busters Science class.  This helped fill in some gaps I’m sure, but like I said, it was very laid back.  No homework or reading assignments.  I did have her at least prepare a written copy for each of her weekly presentations as they came up. I also make about ten index cards per week of vocab/spelling words (pull from lists on internet.  But other than that, i just feel like we’ve not been “doing real school”; more or less winging it, (if that makes sense?).

At the moment, she does not want to, or plan to attend college.  She wants to work with me at our family owned business, marry, and be a homemaker…. this is fine, if that’s what she feels led to do.  But as I have told her, it doesn’t hurt to prepare for higher education.  Her mind may be changed by 18.  The new co op she and our youngest have attended since Christmas is planning to offer an ACT prep class next Fall, plus other electives (Science, Writing, Music/Art appreciation)…we can pick an choose whatever.  I know we will definitely do the ACT prep.  But in the meantime, for the summer, I would like to retry some SCM  style things.  I was thinking of at least continuing Math… but we have not followed the Language Arts from here, or anything else for that matter in a long time.  I have noidea where to even jump in at…

On a different note, back when we were active here, my struggling son (that folks here chimed in so many helpful tips..) has graduated (a tad early due to a great job offer)!  He never wanted college either- works with his hands; and, got hired by the state at one of our local community colleges. So, even though he says no now….it may rub off on him, and he can get free tuition!  But if not, the benefits, (insurance, retirement) and wages are great regardless!!