Improving in a short period

Hi there coach, I would like to ask about my improvement. I have about less than two months left before the varsity try outs and I wanted to top the ranking. That is the reason why I am working hard this time. Recently, I have been Playing in a club for Almost everyday, and each day I give 6 to 7 hours playing. But half of those time, I have been playing very badly and I am wondering if it's because I have played "too much" which could have made me exhausted.

if that is the case, would it be better if I play at least 2 to 3 times a week in the club and have drillings and shadowing during the remaining days of the week? or would I improve faster if I play in the club 7 hours a day for the rest of the remaining time even if I am playing in a bad shape with "out of tuned" strokes sometimes? Or what is the fastest way to improve my game?