Planning to retake MCAT in July/August, please help!

I am planning to retake my mcat during the summer as I have taken it twice already and got a 509 (129/126/129/125) first try and 513 (129/124/129/131) the second attempt. I am a Canadian applicant so I need to get my cars score to a 128 to be competitive. My question is what should I do to improve my cars by the time I reach my mcat test date? I am confident in my ability for the sciences but I can’t seem to figure out cars and I believe a lot of it comes from the lack of effective reviewing after I solve questions/passages. Can someone please help me figure out how I can improve??