I wish I could be more helpful as I don't know what BofA might ask a prospective teller. More than likely they will ask about your background, perhaps your goals, they may want to know how flexible your hours are.
I recommend that you wear the most professional looking outfit you have.
If you are a man, preferably wear a suit and tie, or at least a dress shirt with a tie and dress slacks. Hair should be neat, and any facial hair should be neatly groomed. (Stubble sends the wrong message to an interviewer!)
If you are a woman, preferably wear a dressy suit, or a nice blouse and skirt. Avoid wearing large earings, wear a modest amount of makeup, and no heavy fragrances.
Also, do not chew gum during the interview. Amazing, but I've seen people do that!
I don't know if you are just starting out in your working career, but one of the biggest mistakes I see folks make is to dress too casually for an interview, or to wear something better suited for an evening out.
Try not to figet, and if you don't know what to do with your hands, then clasp them together in front of you. Do not keep your hands in your pocket, and do not fold or cross your arms. Other than that, answer questions honestly, and remember to smile during the interview.
Good luck!
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CRCM,CAMS
Regulations are a poor substitute for ethics.
Just sayin'