At the end of the test window for Test #2, 39 students have completed the test. The average score is 84 and the median score is 89.
The third and final test of the semester is on Part 5 only (Probability). But Part 5 heavily draws on what you learned in Part 4, so a good understanding of the counting techniques in Part 4 is necessary in order to do well in Part 5. The window for Test #3 is April 12-18.