Marketing positions cover a variety of roles, ranging from technical market analysis to creative storytelling. If interviewing for an analytical role, expect to answer statistical questions about market trends and patterns. If interviewing for a non-technical role, focus on highlighting your strong written and oral communication skills as well as your experience running compelling campaigns.
What is your biggest weakness.
Again, with all these questions, they are looking to better understand their applicant. Answer by describing a weakness you have/had and what you have done or are doing to correct it and turn it into a strength. Be enthusiastic.