I clicked on the link you provided in your post and saw there a link for "21 Free Formula-Based Qs" I just completed these Qs and have this feedback:
THESE Qs NEED TO BE UPDATED, as they are based on the PMBOK 5th edition, not the current 6th edition. For example: the answer key says the correct answer for #21 is "B" (18 days), not 17 days, as the PERT formulas calculates. The explanation states: "Adding a 10 percent contingency reserve to it will give 16.67*1.1 = 18.33 days. Rounding your estimate to the nearest day will give 18 days. Reference:
PMBOK Guide 5th Edition, page 171. So, my answer, "A" (17 days) is actually correct.
Here is the link to these (21) 5th edition-based 21 Qs:
hwcdn.libsyn.com/p/7/2/a/72a57b78fc9500a...98a39d4565d22e19569b
Is there a comparable set of Free Formula-Based Qs based on the current PMBOK 6th edition?
Thanks.