I only took the Business Marathon Day classes with Preptackle, and given the objectivity of the materials and didactics of the lecturer, I strongly recommend the courses provided by Preptackle.
In other words, if I had prepared with Preptackle from the start (instead of using another provider), I probably would have studied much more efficiently for the exams.
Considering the number of topics to be studied, a well-structured course that focuses on what really matters can make all the difference.