Ahh, that first year. What I see the most in first year students is two distinct things. On one hand, you have folks who get a little overwhelmed with this new thing in their life. It seemed like a good idea, took some gumption to actually commit, sign up, put on that gi - which is so different from any other work out clothes they've ever had, if they've ever actually worked out before - and get on a floor with a bunch of strangers who do what's being done better than they can do.
Then there's the physical contact. If it's a striking art, nobody is used to getting punched and kicked, especially in the face. Touching of the face is an intimate thing to most people, there's just not a lot of people in their life who ever touch their face. Especially people they really don't know. If it's presented properly, and the strangers they train with make it no big deal and are friendly, or at least not intimidating, they start to get used to it and they progress. But as they do, they are exposed to higher levels of expertise and the cycle usually repeats. It's not an easy transition.
If it's a grappling art, they are in a closer proximity to another person than they have ever been before other than with family, close friends or lovers. Except the other person is trying to dominate and/or submit them. And they are sweating in their face because rolling usually comes at the end of classes when everyone is already sweating. Their faces and necks are engulfed in a way they just aren't used to, there's pressure and weight applied to their chest and torso, and the other person is moving, moving, always moving and they just can't keep up. And other beginners are not relaxed, they're rushed and spastic, always trying to win, win, win. Again, it's not an easy transition from normal life.
On the other hand, people who are athletically gifted get all psyched up and run head first at it. It seems so much easier to them than to other beginners - this is what they're going to do FOREVER! Then that passes with the realization of how much work is ahead and how others, with just a little more experience will have none of their nonsense. What I find with most of these folks is a lack of patience. Once it isn't fun, games and easy - it isn't fun games and easy.
But what I also find is the students you really don't notice for a while. They just keep coming to class, day in and day out. Not particularly talented, not particularly untalented - just your average Joe. Until they're not.
That first year is a tough one. But if they can stick it out for five years or so, then they really have something they can use in life. Hopefully, anyway.