I'll try to answer some of your questions:
the sooner i take the a2 the better right? probably, yes
are there any changes to the admissions requirements? not that I know of, however when I applied for this past fall semester they didn't require a whole lot--- and just one semester later, they now require an interview, and the A2 test. So it would probably be good to keep checking back, although I don't expect a whole lot to change (for example though, now they also want a copy of your syllabus for any A&P classes taken).
when you made an appointment with them, did the counselor give you hints on your chances of getting in based off your transcripts? He was pretty vague about everything, as he has to be--- however I do know that this school has picked up applicants very fast so the sooner, the better your chances are of getting in.
I think my gpa is right around the 2.75 border line. do you think having healthcare experience and an associate degree help me? THe GPA must be a 2.7 minimum. I do not think they take into account the associates degree (I had a BA and it didnt seem to matter) however they do accept credits... and I'm really not sure about healthcare experience, sorry!
do you know how they calculate repeated classes? no clue, sorry
any suggestions/comments on maybe what i should do to up my chances? take a couple more classes? I think you just need to go in and meet with a conselor. Make sure its obvious how willing you are to work hard and how passionate you are about nursing. You have a stronger chance of getting into Chamberlian if you go now, rather than wait.
Hope this helps!