Hi jamesyang424,
Based on your ESR, since your Critical Reasoning score was in the 5th percentile, I agree that you should first spend some time improving your Critical Reasoning skills. When studying Critical Reasoning, your first goal is to fully master the individual Critical Reasoning topics: Strengthen the Argument, Weaken the Argument, Resolve the Paradox, etc. As you learn about each question type, do focused practice so that you can track your skill in answering each type. If, for example, you get a weakening question wrong, ask yourself why. Did you make a careless mistake? Did you not recognize the specific question type? Were you doing too much analysis in your head? Furthermore, you must keep in mind that most Critical Reasoning questions contain one or more trap answers that seem to answer the question but don't really. So, a key part of training to correctly answer Critical Reasoning questions is learning to notice the key logical differences between trap answers and correct answers. This type of recognition will not happen overnight, but as you begin mastering each CR topic, you will find that your ability to pick out trap answers is greatly elevated.
If you’d also like advice regarding how to improve your Sentence Correction and Reading Comprehension skills, feel free to reach out, and I can provide some further advice.
Good luck!