2018 actual a.m. session being entitled mock

Has anyone wondered the reason for one of the past 3 YRs actual a.m. sessions - the 2018 exam - being called “mock” on the front page? 2017 and 2016 did not have “mock” name.

I know that there is a mock entitled 2019.

In total there are 4 exams on cfa website right?

I think because they chg certain ques from 2018 actual exam eg equity.

So Equity, Fixed Income, Private Wealth and Behavioral are mock questions and were not on last years exam.

Most of the exam is the same with some minor changes to Equity and a few other areas. i forgot which other sections were different that i remember on the actual 2018 exam