Hi
@aoi05! I think you're off to a good start by doing practice exams. In my opinion, one of the best strategies to improve on the critical reading section (or any section in general) is to work on practice exams. Specifically for the critical reading section, I would pay close attention on summarizing each individual paragraph with 2-6 words. This helps you form a concise summary either written down on your whiteboard or in your head so that you know where to reference if necessary. In addition, I like to pay close attention to transition words since this helps me identify the author's tone which is important when working with all types of questions including main idea, inference, or application type questions. Finally, if the passage presents a series of interlinked thoughts, processes, or events, it may be a good idea to jot it down in boxed or picture forms on your whiteboard. This can also help with organizing the information you are reading.
I hope this helps and good luck!