Leor,
Since you have already taken one (or more) exams, you can indeed use this as a gauge by retaking the same exam after the camp. But it's not perfect since you will probably also remember what the correct answer was. Still it will give you an indication as to your improvement thanks to the boot camp. Take it with a grain of salt.
But I would now recommend that you stop taking any further exams and instead read the following 3 documents/books: The PMP Exam Content Outline (which explains what you will be tested on during the exam), The PMBOK Guide 7th Edition (good foundation on general PM) and The Agile Practice Guide (good foundation for agile PM).
These 3 will give you a great head start. Don't worry if things are confusing when you read them. The boot camp will clarify things. (If it doesn't then ask for your money back!).