We have managed this for many years for D14 without meds. I can't say we have done anything special, although honestly, this first year of high school is making me wonder if we should have tried medication after all. Her disorganization is breathtaking... but she is just so darned smart that she is still able to pull decent grades in spite of it. She attends an independent private school with small class sizes and a liberal arts focus, so there has been plenty of teacher attention, which definitely helped through the years.
We never tried meds, we decided to see if she could be successful without them. I was afraid of dulling that "smart spark". We have never asked for accomodations in the classroom, although this year's math teacher decided on her own to structure D's tests so she only sees one problem per page. It has helped her, so we likely will ask for this in other math classes.