Motivation Challenge - "Fail? So What?"

Exams is round the corner.. but I can't help but feel that some of our students are not really taking it seriously. Many still owe assignments and a number of them missed the class test. Being a teacher with extra TLC (Tender Loving Care), I would arrange for those who missed their test to retake. Hopefully by showing them extra care and concern, they would turn up and perhaps help them score some course work marks.. some of the student are appreaciative. However, a handful of them is simply "bo-chiap". "Fail? So What?".. "Just fail me lor.." was their reply. I sometimes find it hard to talk senses into these group of students, I would lose my cool and raise my voice on them. Well, I guess that when you have experienced failures for a few times, you tends to get used to it, therefore ..."so what is so big deal if I flunk again, is there any different?" is this the reason for such a behaviour?

Hmm.. Need to explore why the behaviour and what would be response would best suit these group of students?