Advice on how to impress a smart guy on the first meeting for an arranged marriage?

So there’s a really smart guy that I’m going to meet for the first time in a week for an arranged marriage. From what I heard is that he’s a doctor and has graduated from Harvard. He’s also very knowledgeable about various different areas. Me on the other hand, I’m not very smart, I get average grades in college and I’m childish, I look average too.
I know the key is confidence but I feel that the gap is too huge to just fill with confidence.

Can you please give me advice on how to impress such a guy, or what I can do in this short period of time that may help me in anyway.
Thanks in advance.