midterm tomorrow

My students take midterms tomorrow and i am a little nervous about their success.  I have done all i could to prepare them but I am a little frs\ustrated with their lack of desire.  I have offered review sessions the past two days after their other midterm exams and only had ONE student show up total!!!!  I hate hen my students fail, but I don’t see how i wont have a group of failures tomorrow.  People tell me to don’t worry about it, it happens, but it still ticks me off and frustrates me.