Concur with the comment above.
However, be prepared to walk through the basics of operating model, valuation, LBO models and maybe Merger model. Considering it is just a summer internship, I guess the questions should not be that technical at all, probably testing your business sense (similar to those said above, identifying drivers, growth potentials etc.)
I actually wonder if they would have projected financial for you to do a simple DCF...hmm.... not too sure about this one.