I know this thread is a few weeks old, but I thought I could add some insight as an NCAA gymnast myself.
Some things to consider: Athletes at Div. I schools get lots of extra benefits regarding academics. Free tutors, study sessions, a special study center only for athletes, etc are all "extras" that are available to NCAA athletes.
More people are invested in said athlete's success in school, and therefore are more willing to offer help in academic areas. At my university, all freshmen athletes are required to meet with their athletic academic advisor once per week for their entire first year. This is on top of any meetings they may have with their normal academic advisor (specific to their major).
Depending on the school (and it obviously varies within each school depending on the specific professor), extensions on assignments or papers are easy to request and receive as student athletes. This is particularly true if the athlete has made an attempt to introduce him or herself to his/her instructors.
Finally, travel dates are known well in advance, as are most assignments, tests, quizzes, etc. As long as the athlete takes responsibilty for his/herself in time management and planning, it is not difficult to maintain a good GPA and excel in athletics.
Tweety
PS: if anyone has any specific questions, feel free to ask. I'll do my best to answer.