Ah ok. Would it be possible to do 2 summer subjects and still do well in both of them?
Ummm it's possible, but it really does depend on a number of things e.g. the amount of time you're willing to spend on the subjects, the difficulty of the subjects and the subsequent time commitment required to do well...
You have to remember that the summer semester subjects are generally done double speed (there are exceptions e.g. Finance 1 is taken triple speed, to the best of my knowledge), and so you really do have to work quite hard to stay on top of the content and keep up with the pace. If you choose your subjects well and cater to your own strengths, and are willing to invest the time and effort, there shouldn't be a reason that you can't do well. However, I wouldn't underestimate the kind of commitment summer subjects require, they're really easy to fall behind in.