According to the rules, you can’t do that. You have 5 years to play 4 seasons.
The NCAA is kinda fishy about sixth years, though. Here’s an interesting piece about it:
BoW Sports AnalyticsNCAA 6th Year Database is now available *UPDATE* The NCAA has granted Ed Davis a 6th year. After the ruling, I wrote a follow-up article that can be found here NCAA rules are notoriously difficult to navigate. Determining whether a player may be approved for a 6th year (instead of the standard 5 year limit) to…
https://borderingonwisdom.wordpress.com/2016/06/23/ncaa-6th-year-of-eligibility/[https://www.google.com/amp/s/borderingonwisdom.wordpress.com/2016/06/23/ncaa-6th-year-of-eligibility/amp/]
The linked spreadsheet has links to articles about each petition. Some of the NCAA decisions don’t seem to make sense on the surface. The rules are pretty clear, actually.