do whatever you can, don't call it "over" till its over or you are limiting yourself, do whatever you need to do, if you can take one extra class in the summer take it and crush it to make-up for other classes where you didn't do so well, when people see you are making an effort they will be much more likely to do things in your favour (ie. give you better marks) and if it is the difference of 1% or 2% your consistent effort might be what is needed for them to make sure you get the mark you need, dont give up...what uni did you apply to? I am just finished my university degree at a Canadian university