Be prepared for technical questions related to software testing methodologies and techniques. Also, be ready to discuss how you work in teams, your organization, time management, and communication skills as these are all important to that career.
Be honest, as a new graduate you don’t have alot of experience but if you are a hard worker you can stress that. Be sure to use active listening approaches, especially if you are unsure of the question, and also ask them if you have answered the question to their satisfaction or if they need you to elaborate.
Dress for the interview, remember to breath deep to control your nerves, speak clearly, be sure to thank them for their time, and show interest by asking about the next steps of the interview process. Good luck.