I think you can do it in 5 months, if you are familiar with the C# and OOP philosophy. It will take a good amount of work and a lot of coding. I also did the Udemy Java MasterClass and used OCA Book by Boyarski and Selikoff. Of course, I have reviewed countless articles on specific subjects. Also, the Enthuware exam prep questions are tough, probably tougher than most questions on the exam. As long as you can score 70 or above on those Enthuware tests and fully understand all of their explanations, you should be fine. Enthuware does a good job of mixing all kinds of terminology, coding examples, and rules questions to ensure you understand what you are talking about. Hope my experience helps out. Bonne chance!