Becoming a CNA may be beneficial to you, but may not put any money in your pocket before nursing school. If money is not an issue, I would say you should consider it. You could learn quite a bit, and expose yourself to the world of nursing. But there could be drawbacks, depending on where you work, and how long the CNA course is.
A friend of mine became a CNA, and literally all she did was change bedpans, clean poop, and change beds. The ONLY patient contact she had, truly, was with the "rear". And all for the lovely starting salary of $13/hr. She also did this in preparation for LPN school, which she eventually did go to, but needed alot of financial aid, since her job paid so poorly, and she got the worst hours.
But.......there were several people whom I spoke with at a meeting for prospective RN's at one of the schools I applied to that were CNA in hospitals, not LTC facilities, who LOVED their job, had a lot of good patient contact, learned a LOT from the nurses, and got paid well for their time and shift differential.
I think you should research the facility offering the CNA course (I know a lot of LTC facilities around here offer it, in exchange for a year's worth of employment, hence the low pay).
Overall though, I think any exposure to the health field can only be a plus for a nursing or prospective nursing student.
I'm not a CNA, so many some CNA's will offer much better advice. All of mine is second-hand stuff! :imbar