Hi Saskvet,
I recently took the BCSE using Zuku Review, and passed. They only took 2 weeks to notify me, which was great.
I did 100% of the study-mode questions, and about half of the test-mode questions. Towards the end I was getting an average of 55 or 56/60 on the test-mode tests.
No, the Zuku questions aren't similar to the BCSE questions, but that is not the idea either! What they ARE similar in, is material. As you well know by now, they cover all the major topics, the classical signs associated with diseases, common Dx, basic clinical terminology, etc...
By answering one question right or wrong, Zuku opens up a whole new horizon of topics just in their explanation alone. It is this general knowledge, and your own innate flexibility of being able to apply these concepts to different types of questions and situations, which ultimately will allow you to pass the BCSE or any other board exams.
I depended almost completely on Zuku Review, having not opened a single book. I only searched certain topics on google once in a while. I did this off and on for about 3 months, and managed to pass the BCSE. It is a good program!