If your homeschooled child might do a college sport they will have to have their homeschool plan approved by the NCAA. The problem is that the plan is for all of high school so if your student decides in their junior or senior year that indeed they want to play a college sport the look-back by the NCAA goes back to grade nine. Their approval is a look-back process but the challenge for homeschooling families is if they already finished a year's academics then find out a course was rejected it can be a problem especially if it is a core requirement!
From what friends and homeschool mom strangers have told me the NCAA favors secular curriculum that looks as much like public school as possible. They like textbooks and the same exact ones that the schools use. You will need to submit details on all the textbooks and books including the ISBN (so do not get rid of those textbooks and workbooks until after you have documented the ISBNs). Any religion course will not count and some humanities courses will not count. The more creative you get with your plan, the riskier it gets.
I do not like hoop jumping in general but I dislike even more, vague hoop jumping. I would prefer it if the NCAA was more open with a list of materials that they always approve so we could be sure to select one from the list.
It is a lot of pressure for a homeschooling mother to design a plan while trying to jump through multiple litmus test hoops. At present my older son wants to be an engineer which has strict guidelines for college prerequisites, even stricter than a liberal arts student. Now I am also trying to match what the NCAA wants. I also have some state requirements. By the time I am finished with these various restrictions I feel like there is little wiggle room left for creative out of the box homeschooling.
The NCAA requires traditional A-F grading.
For more information about the NCAA here is their website. However I will caution you that they don't tell much up front. You have to register your student with a login to gain access to most of the content.