General comments.

1. File management, navigation, etc.
(first month of first semester)

2.Worksheet formatting
(spread out over first semester)

3. Exact arithmetic, algebra, symbolic calculations
(first month of first semester)

4. Basic data structures, pure functions
(mid semester of calculus I)

5. Plotting
(spread out over first semester)

6. Reading and writing data
(optional)

7. Calculus and the student package
(spread out over first two semesters)

8. Basic programming
(optional)