Need Advice ASAP

Hi - struggling to come to a decision on my own. I scored a 161 in June and then a 164 in August. My goal is to hit the 170s. I am signed up to take the September test on Thursday but I have not been able to score above a 165 during practice. Do I take the test this week? I also am signed up for October. I work full time and feel as though it's so difficult to fit in study time. Super stressed ! Any tips? I feel like it's silly to waste the money and it feels like a failure deferring the date.