Put the past behind you, and plan to never make bad grades again. Grades are not the only thing that get you accepted into CRNA school. I just got accepted into school with some pretty big blemishes on my transcripts. I had 2 Fs and a couple of Cs. None of those were in nursing. I had a 3.2 gpa from nursing courses and a 1210 on my gre and 7+ years CVICU work experience. In the interview they told me that people are allowed to make mistakes, as long as they improve. Make As and Bs in your nursing courses, nail your GRE score and get great work expience and references when you apply to school.