Very effective and helpful or I must say hands on.

Gave the test 2 days ago and passed :). Thanks to analytics exam sample tests. The questions are very close to the actual exam. Most of them are repeated. Practice as much as possible and once you start scoring in 90s, you are good to go :) 
highly recommended, I am going to use it for my other certification exams as well that I plan to give in the future. 

Sameera