I think that I changed my mind!

I have interview tomorrow with Agency. First, of all I have not had a chance to review my Nclex much. I am scared at how many questions tht I was missing. So, I know that I am definitely not ready. I am okay with dosage calculations, but that is about it.
Also, I have not worked in 4 yrs.
And, only have 5 1/2 yrs. in behavioral health field. I did mention that on my resume. I only want to work behavioral health, as that is all that I feel qualified for. However, after reading about agencies, it seems like they don't care if you are qualified. I definitely need to study more and re-think this agency nursing.
I think that I may call tomorrow morning and tell them and tell a fib.(like I accepted another position)