Low Diagnostic Score--Advice Needed

Hello, I plan to take the LSAT in September and took a diagnostic today. My score was 153. I know it isn't bad for a diagnostic, however, my target score is 170+, and I am worried I will not reach that by September. I reviewed the exam and realized some mistakes were due to losing focus and missing a key word, and some questions I did not even understand.

Please give me advice that helped you improve your diagnostic to your target score! Thank you so much.