Frequent and free updates here

I am very fond of all things free. And i do not know how can not anyone like anything free. With the IBM C1000-154 certification exam approaching and me being almost done with the syllabus i thought of practicing on something practical and came across IBM Watson Data Scientist v1 mock tests. These mocks are very good because - they are online, these are simulated and thirdly these give the updates by the recently certified candidates. How can i not choose this for practice?