Is low motivation a sign that one is studying the wrong thing or in the wrong line of work for him or her?

Low motivation can come from lots of sources. Frustration that things are difficult and that one won't do well is one reason. A person can have low motivation due to depression from another reason, as they things will remain the same and will just continue forever that there is no end to studying. A lot of things come together to make one realize something is not the right line of work.

Not always. Sometime low motivation can be a symptom of a problem outside of work, and may even be tied to depression. I suggest consulting a counselor. It has certainly helped me- I was going to give up on being a teacher after a shaking experience in my student teaching. I've now been teaching for five years!!!

Those are great excuses for being lazy.

Not understanding what he or she is studying for that type of work. They need more guidence or on the job training for the job that their preforming.......

no.... I think it means they're lazy and expect everything to come to them EASY

No, it just means you're lazy!

probably both