I began working a couple of weeks ago and I saw a score drop as well. I thought it might be due to burnout and my brain being too full to concentrate. I took a bit of time to calm down and reset my mind and my most recent score has been my best yet. I think drilling the week of the test is not as important as taking time to make sure you’re in the right headspace (and have enough sleep) to perform well on test day. Don’t let the past week or two of scores get you down, sometimes our brains can only process so much, and you need to give it a break so it can do its thing.