Which concepts of OO Programming to focus on?

I am about to do an interview in a few weeks for a C++ job, (entry level position/junior programmer), and I am wanting to review some of my old class work. I was wondering if anyone could recommend some "concepts" of programming that I could focus on? I'm really trying to blow them out of the park, however I have never been in a programming interview before, and not really sure how to prepare for it. This is my one shot to get my foot in the door, as entry level jobs are pretty rare where I am from. Any advice would be helpful!

Best Regards
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