Well, school does not get easier when you start CRNA school, and it is science intensive. Ask yourself, honestly, why you did not do well in some classes, and decide if that can be improved. Maybe you got sick, had a child, had to move, had money problems,etc, if not, maybe you should look elsewhere. I don't undertand quitting your current job, paying tens of thousands of dollars, maybe moving, all just to drop out after one semester. You have to be honest and objective with yourself. Certainly, take a graduate level statistics course, or chemistry course, or physiology course, and let that be your guide.
I also would urge you NOT to apply to the big, giant, puppy mill programs. Of course they may accept you. They have a few hundred initial spots, so what do they have to lose? Apply to a smaller, leaner school, where, if you get accepted, you can be certain they feel that you will have what it takes to make it. Again, starting school is a major, life changing event. Just because you want it really badly does not mean you will succeed. Do away with some of the guess work.