You can draw your own conclusions from this information. It fits into several possible narratives. And then there's this from the letter JFK's father wrote to Harvard before his son enrolled.
Jack has a very brilliant mind for the things in which he is interested, but is careless and lacks application in those in which he is not interested. This is, of course, a bad fault.JFK's Unimpressive Harvard Application
I found this on Ann Althouse's blog