If this is a CPA firm, at the entry level they know you don't know anything.  They want to see your personality and see if you can think on your feet.  Try to come up with stories of your past work experience and tie it to what they ask for.  Let them know you can work under a budget and can be organized.  Give stories and references to attest to this. 

Also, DO NOT imply that you wish to get certified on their dime and then go to private (even if it's true).  Express that you want to be competitive and make partner at the firm.

No offer because they still have some other office interviews this week. Decision expected early next week. If you ask me, I think I left a good impression but you never know. They asked me some questions about myself and passing CPA Exam.

I would hope to get an offer. Will keep you posted of the outcome.