citi OCR Summer Analyst – Quantitative Trading & Analysis

Hello, I am a MA student in NY. I just received an OCR interview (30min) with Citi, and the position is Summer Analyst - Quantitative Trading & Analysis.

I honestly don't know why they invited me for this interview as I have only taken a few calculus, differential equations, basic statistics class (like econometrics) and c++ classes when I was an undergrad.

So I was wondering if anyone knows:
1. What the interview will be like? Are there going to be a lot of math, programming or brainteasers questions?

2, Any advice on how to prepare for this interview based on my academic background?

Thanks a lot!

ps: Below is the selected job description:

Summer Analysts can expect to build tools and models that assist traders and clients in pricing, hedging, and structuring of securities, and provide critical information and advice for managing risk across all market trading units. Summer Analysts can also expect to be involved in research and analysis that is distributed both internally and to our clients.
Although the program includes formal training, the heart of the program is a research project. This project allows Summer Analysts to work directly with a research analyst to develop an understanding of a specific segment of the market and contribute to the research produced by the department. Examples of possible project topics include the following:
* Modeling financial products such as Mortgage-backed Securities
* Creating a survey of banking and thrift industries
* Developing a system for analyzing data
* Contributing to a bond market strategy publication