Hi W.,
I did homeschool with my 3 children, off and on with public school. I know there can be alot of days when things seem totally out of control and crazy. I want to offer you encouragment and support, I think you are very wise.
By the way, my 3 children each started college at the age of 15. My oldest daughter got a masters degree and then went to law school, and is now a prosecutor.
My son is now in graduate school to earn a masters degree in math. (He wouldn't allow me to teach him math.)
My youngest graduated from college last year and is now employeed. All 3 graduated with "honors".
The easiest and briefest advice I can give you now is, as much as possible, allow your older children to make their own decisions about what they want to "learn". It may take awhile before they get interested in something specific, be patient. When they do find something, then do your best to find all the info and resourses about that topic. They will be so motivated to learn they will want to study day and night.
If you plan to "test" them throughout the year, show them the test and inform them about it. If they fail the test, that's OK, allow them to fail.
Parents may worry (it's normal), how will my kids go to college and succeed in the "real world" if they don't have a rigerous curriculum when they are young. I told my kids, if you want to earn a college degree, you play by "their", the university's rules. If you don't like a teacher or a class, you can usually drop the class, take it later, find another teacher, etc, to fulfill the graduation requirements. This empowers them to set their own goals, and know that their decisions are valid.
A few times, my kids decided to go back to public school, I supported their decision, and I was off the hook for any wineing about getting up early, they had made the decision. They went back into the classroom and were top students in their grades.
For kids, anything that smells like "busy work" or unnecessary repetition, is actually an insult, unless they get a kick out of doing something specific repititiously.
Your older ones can begin to "teach" your younger ones, if their personalities are compatable, and the younger ones are treated with respect.
Hang in there, you're doing fine, it IS worth it!
M. M.