I'm in a similar boat, I've hit a ceiling at V35. I've only scored above 40 once, in about 8 CATs, and my mistakes are somewhat random, I am getting the 700-800 questions, but often it's hard to get a few of them right in a row to keep the ball rolling up to V40, also i think RCs are slowing me down
but good luck to you sir, love to hear if you can do V15 points in one month that would sure be something.
I went from V22 to V41 in about 40 days, but again, those are only two individual scores my average for V is more like 34-35.
Back to the grind, goal 700+