If an alumnus cannot understand what you are talking about, chances are that the company representative who will interview you won't either. You should reconsider the content or the way you communicate it. Finally you arrive at the communication stage. At the interview, you should have in mind that recruiters of the company will be very busy. They have to interview several hundred job-seekers, so you should get straight to the point.
Explanations can come later.
If this order is reversed, don't expect the recruiter to listen to you. It's best to avoid telling lies. But you need not mention any of your weak points if they do not ask, even if you do mention your strong points. It is important for you to be full of energy and be cheerful, but you don't necessarily have to be eloquent. If you want a job at that company, you can go straight to the point.