Critical Reading help...

Hello cc, I am an incoming sophomore with a lot of free time this summer. I took the SAT practice test in April and scored a 1670 (math=640, CR=520 W=510). After working through some of the official SAT online course I scored a 1880 this past week (M=740, CR=530, W=610). I haven’t spent an extensive amount of time working on achieving a higher score, but I do plan on working hard in the next few weeks to prepare myself for the November SAT. I am just wondering how I should improve my CR score! Can anyone else relate to such a big drop off from a math score to a CR score? Obviously I will be submitting my score on the new SAT when I apply to colleges, but I don’t think they can change the SAT to extent where all this work would be useless. If anyone could allude me to some potential helpful resources or tips for the CR section that would be great!