I do about one Flex test every other day alternating between reviewing and taking the exam.

I am taking the test on the 11th as well and honestly last week I was getting low 150s as well which was a decrease in the score I had been averaging (around a 158). I initially was taking a practice test every single day but got to the point where I believe subconsciously I became disinterested as it started to feel mundane, this brought with me self doubt and anxiety about my upcoming test date to the point where I was losing sleep. I took some time to reflect and review where I was really falling short for the next two days (in my case reading comprehension) as well as deciding to adjust my study schedule to do a practice test every other day while reviewing the previously taken test on the day in between. This allowed me to focus on a specific area of improvement that I knew was really holding me back from my potential, as well as relax and enjoy the process rather than feel like I was stuck in a routine. Once I did this my scores increased tremendously and I am now exceeding where I was currently averaging in the mid 160s.

Another key thing is to take some time to do some things you enjoy over the course of the next few days and weekend and believe in the process and what you have accomplished up to this point. It is crucial that if you haven't already, you begin to train your mind to be 100% relaxed and confident in your ability when you take these tests (trust the process) and that you have the belief that the preparation you put in will pay off. I'm sure you will do great come test day, just remember you have to believe in yourself and avoid the mindset of self doubt. This is easier said than done I know, but also in my opinion is incredibly important for your actual performance come test day.

Cheers!