PE Interviews, slightly confused

So I'm slightly confused, I had two real estate PE interviews for a summer internship. I guess my background in civil engineering and working for an asset mgmt company before has prepared me somewhat. My only worry now is that when 2nd round approaches and they start asking for modeling experience, I have none and no ibanking experience, then they realized I have nothing to show for.

I have somewhat been exposed to financial modeling at my top school, through my Project Finance and Finance for Non-MBAs class . I was hoping someone can help me out and maybe give me some direction where I can find financial models online. Or is there a really good website to help beginners in financial modeling.

Thanks a bunch!