NEED advice please..

I just received a call from one of the facilities I applied like 2 months ago for a Resident Care Aide position, and they want to schedule me for an interview, and with my experience after you passed the interview they would let you get in the facility right away.. But since I am about to take NCLEX RN this September, I am kind of confused whether to take the oppurtunity and work at the same time, I am just a bit worried that it will be just few weeks before my exam and that I might not have time to review then. I am really confused if I should return the call and get myself in or decline because it's really hard to find a job in a healthcare field. I don't know what to say if ever I return the call and what to say at the interview regarding my goal to have my RN license. I badly need your advice on this situation. Please let me know what is your opinion. Thanks a lot!