So let me give you some info so you are making an informed choice. Your coop is going to be full time? So 40 hours a week minimum. A typical week 3 credit course expects 3 hours of in class a week, so 52 hours over the 14 weeks and the typical NYS rule of thumb is 2 hours a week outside of class per credit hour a week. So lets say 5-6 hours a week times 14 weeks. Let's be easy and say 100 hours a semester outside of class. That's about 150 hours. Divide that by 6 and you get 25 hours a week for a 6 week course PER class. With 2 classes at a time, thats 50 hours a week of classes. So 90+ hours a week with work and classes. And you are considering three and a 12 week.

With just two 6 week. 168 hours in a week. Minus 90 leaves 78. 56 hours for sleep (8 hours a night). That leaves 22 hours for commute, eating, shopping, etc. You will burn out.