I would leave out the first "anthropomorphic character illustration", think of your audience. The second "anthropomorphic character illustration" has some points that could be reworked if you have the time to do so. They are not as strong as some of your other works. I think your sketchier stuff is visually interesting and I would leave those in. I don't have much to say about whether or not the rest of the pieces should go into your portfolio or not. I know that not much will make up for poor academic performance but the portfolio is a chance to argue your validity as a student. You might have to accept that most of your credits won't transfer. Schools don't like to take transfer credits usually, they like money, any excuse for enrolling you in more classes and they will take do it. Think of your portfolio as a part of an argument, "why I should be placed into your school". My grades were poor before being enrolled in school, but thankfully art school is more about proving yourself with skills then on high school chemistry grades (or something similar). Show passion, intensity and dedication.
Good luck to you.
"Now punch that laziness in the face!" -Bobby Chiu