I was pretty much in the exact same situation as you. Going to second what someone else said, you are freaking yourself out. I did the exact same thing, studied for months on end, PTed in the mid 170s constantly was scoring significantly lower on actual tests. I didn’t study before my last test, I hardly did any review and I just focused on relaxing and letting my brain work. I needed to get out of my own way and let my brain do what it needed to do. My last test I finally got into the 170s, it is totally doable, you are prepared and capable.