First and formost my impression from a recent interview was your performance during the interview and your clinical experience.
GPA is great but it's not everything, first we must consider that even though all BSN RN programs are accredited, some are more difficult than others. ie a 2.8 at Yale School of Nursing or Case Western is more esteem than a 3.8 at noname podunk U. IMHO.
Secondly, the admissions committee wants to see how mature are you, how long have you wanted to do this, what have you done to research about the profession, and of course what do you know about the program you are applying for.
An Applicant may look great on paper, but lack a real indepth clinical experience, is this person someone who just did one year of ICU care, I don't think I have to remind you that not all ICUs are the same. Secondly, is this person at the level where they are teaching/precepting thier peers. I've met nurses who have years and years to experience in on field but can not for the life of them handle the stress of presenting their subject of expertise to strangers. This shows a valuble trait, can this potential student handle stress, ie. having a difficult time with an intubation, while the clinical instructor, surgeon, or-rn, residents, everybody else impatiently waiting on them to get the job done.
Jay, my recommendations to you is to seek at least 2-3yrs of critical care ICU experience with recovery of cardiothoracic patients, management of neurosurgery patients in trauma, possibly a burn icu. Take a break from pre-hospital and er department, because of the unfair generalization is that er/pre-hospital personnel are great about prioriziting emergencys and deficent on monitoring a critically ill patient and having to ablity to critically think through a problem. Personally, I feel this generalization is unfair, however, i've heard this statement from five different crna educators.
As mentioned before, most programs recommend the CCRN, and some now require it. The exam is not impossible, it simple means that you have met a standard, and to the CRNA admissions comm. it says you are ready.
If you do not take an organic or biochem chemistry course in undergrad, take it the year before you apply. all the programs i've had interest in, have first recommended it and/or required it. I took mine at a community college, an organic/biochem course for nurses or nonscience majors, if your not sure, call the school and ask them what do they recommend/require.
One last thing, your performance during the interview, mine, consisted of a multitude of oral questions, if you see this what is going, what should you do next, why.
basically a lot of things to second guess yourself, without room to BS. It was no give me questions like, "what's going on if you have diminished breath sounds, and the trachea is off midline?" More like, look at this abg, what is it, what is causing it, how would it be corrected, and what's going on at the tissue level. One thing they want to see is how well you do while being prodded or pimped with questions, trying to get you to second guess or doubt yourself, even agitate you a little, all comes down to how well do you handle stress.
Hope this helps, best of luck.