The window for Test #3 is November 14-20, i.e. Thursday of this week through Wednesday of next week. Today I've made available in WebAssign an extensive list of practice problems. This is NOT a practice test. As pointed out in the description of that WebAssignment, the problem set is about 2.5 times the length of the test, and all the problems in the practice set are recycled homework questions (generally with different numerical values in the practice assignment). So this practice set of problems is a great way to see how well you understand the homework assignments from Part 5.
Make use of the practice assignment any way that you like. It is purely optional and has no effect on your grade. But it's useful for preparing yourself for the test.