Weaknesses

Like everyone else, I have have weaknesses which I constantly struggle with. The two main ones are focus and memory. I have very short term memory, and that I don't think I can do much to change it. However, my lack of concentration should be alterable. Problem is, I don't know how to stay focused, and it's really becoming a problem for me as I enter the final quarter of my first year at university. Assignments and readings are piling up gradually, and I just can't seem to get myself to work. It's frustrating. I'm not sure how to change.