Hi Russ:
Good day!
With your purchase, you would have got a bunch of formula-based PMP sample questions. Solving these will give you a good experience of formula based questions. Further, if you have purchased the PMP Exam Simulator, you can run it in different modes. You can take either the 8 full-length, simulated exams, or you can take X number of questions for any knowledge area. Now most of the formula based questions will appear in the cost management knowledge area.
Regards,
Khurram