Study Lesson 6 (Determinants and Their Properties), Lesson 7 (Adjoint Matrices), and Lesson 8 (Cramer's Rule) to prepare
for assignment 5.
LESSONS TO STUDY FOR YOUR EXAM EVEN THOUGH THEY AREN'T ON ASSIGNMENTS:
Do note that this means you have never had an assignment that involves the concepts of Lesson 11 (Vector Spaces and Subspaces), Lesson 12 (Linear Independence), and Lesson 13 (Basis and Dimension). However, your course materials do teach these topics and they may appear on your final exam.
If you look at the most recent sample final exam they provide (and you certainly should, as the sample exams are a good indication of what you can expect on your exam), you will see that Lessons 11, 12 and 13 are all included on the exam. I think you should familiarize yourself with Lessons 11, 12 and 13 to be safe, but realize that Lesson 11 is pretty challenging (and, I wouldn't lose a lot of sleep if you don't grasp it; few students do).
OMIT LESSONS 15 AND 16!
Lesson 15 (Linear Transformations) and Lesson 16 (Eigenvalues and Eigenvectors) is definitely not in the distance course. Those topics are only taught in the classroom lecture course.