what i will recommend is: take some initiative. don't rely on the professor to "teach it to you", be motivated to learn it, by whatever means necessary. you are not limited to learning linear algebra from just the text you use in class, you are free to read as many books on the subject as you please, until you find one that works for you. there are online resources, online textbooks and online class notes available everywhere (one site that comes up frequently here is: Pauls Online Notes : Linear Algebra
another good supplement is Khan Academy
which has thousands of helpful videos, on many mathematical topics, including several on linear algebra. and don't forget about us. we're not supposed to do your homework, but if there is some principle you don't understand, we'll give you all the help the rules allow (just don't expect us to do the teaching...many of the posters here have their own homework to do, and we're not an unpaid tutor service).
there's also some good folks (some of who post here as well) at physicsforums.com, which has a very good math section.
don't stress about the grade. learn the material, and you will get a good grade. it really is that simple.