What I'd like to work on in a writing class

While I am in this writing class I would like to improve a few things.  I would like to be able to give my idea to the reader in fewer sentences than I usually do.  My professors and fellow students have always pointed this out in my papers.  I have always had this problem and I would like to finally get it settled.  I would also like to work on my ability to argue my point in an effective way so that the readers will see my point and completely understand it.  I feel like I can do this fairly okay but I would like to improve on it much more.  With this I can be able to to effectively convince the reader my point of view is the right one.  However, I feel like I can improve on all aspects on my writing skills because there is always room for improvement.  I'm just hoping that this class will help me be a better writer in every aspect possible.