Any advice?

I have been studying for two months now. First month, I studied on my own, then later found GregMat and have been using the one-month plan for the past month. The first half of the month, I definitely felt I was improving. In the past two weeks or so, though, I find I am now doing consistently worse than before (went from scoring 165V consistently to 159, 155Q to 150, and more questions incorrect on practices, even untimed). Any advice? I know there can be variability in scores and such, but it’s so scary. I feel that GregMat has truly been so helpful, so I don’t know what’s going on. I take my test next week (aiming for a 320+), so I’m kind of bugging out. Am I doing something wrong? I follow the plan pretty religiously with additional practice and vocab review. :’) <— me, bugging out