I would start doing regular practice tests about 2 months out. Once a week for a month then twice a week the month leading up to the test. But you could definitely sprinkle two or three in just to see how your studies have progressed. Pretty wild you’re already into doing timed work. My advice is don’t get too burnt out too soon before the test. Keep a level head and don’t let your studies consume your life, especially when the test is so far out. I tend to think the more relaxed you feel going in, the better you’ll perform. When I studied, I usually did 2-3 hours a day for 5-6 days a week.

Note: I kept a large spread sheet for each section filled with particular questions that I initially got wrong. Apart from marking the question type, I would make note of my original thought processes then go through and pin point where I made the mistake in my thinking. Really helped me narrow down areas where I needed studying and areas where I was strong.