If you take HS credit courses in 7th or 8th grade, then you must "make that up" at the HS level. For example:
If a student takes English I in the 8th grade, when he gets to HS, he will need to take four years of English per the NCAA Clearinghouse criteria. Thus he could take English II (9th), English III (10th), English IV (11th), and then have to have a fourth English at some point such as Drama or some other approved English credit course.
This often happens with "high achievers" that take HS credit courses at the middle school level. You just have to pay attention to the criteria as your progress through HS. It's beneficial to have a proactive Guidance Department as well.
