Our first test covered Parts 1 and 2 of the course, which are entirely unrelated. However, Part 3 ties Parts 1 and 2 together. The simplex method for both standard and nonstandard problems provides a way to use the matrix operations learned in Part 1 as an approach to solving linear programming problems as encountered in Part 2.
Part 4, however, starts us all over again. Nothing in Part 4 has any relationship at all with Parts 1, 2, or 3. However, Part 4 is absolutely essential for Part 5. Part 6 will come along at the end of the semester and tie together Part 5 and Part 1, so the first half of the course and the last half will reconnect toward the end of the semester.
If you have struggled at all in Parts 1,2, or 3, then Part 4 offers a fresh start.