Not at all! How much time you need and how much work you have to do depends on your time and abilities. You’re ready when you get the score you want. So if you spend 4 weeks prepping and take 2 tests and are scoring the exact score you want, you should sign up and take a test immediately! Some people will be ready after 2 tests, some might need all 7. It depends on how much time you have to prep and the score you are aiming for!
Our recommendation is to spend 3-4 months prepping and take a test every 2-3 weeks. Once you start hitting your desired score, make sure to sign up and take a test as soon as possible!