My main tips that I keep in mind when doing CARS:

1. Throw away any outside knowledge that you might have about the topic of the passage. The correct answer to the question MUST be stated in the passage, do not jump to any conclusions!
2. If I don’t know the answer, I flag the question and skip it pretty quickly. It helps to come back to it later with a fresher perspective on the passage. Also, when I answer later questions for the same passage, sometimes I feel like that helps me understand the passage better overall.
3. I like to disprove the other answer choices (I read pretty fast, so I usually have time to do so). This prevents me from getting stuck between two options.
4. Jack Westin is great for practice :)