CR is definitely possible to raise. Can’t promise you’ll make a 120 point jump in four weeks but you can get in the 600’s. Work on vocabulary; don’t memorize it. LEARN IT. You seem to be fine with it but you can always improve. There’s always room for improvement. With the passages, learn what works for you in the time frame. I usually read the whole passage and then go straight into the questions. I don’t read the questions first. You usually have to go back to the passage anyways from the questions depending.
Learn how to analyze what is meant and what is said. Learn how to discern the parts where something is actually explicitly said. Take this question:
"The skier was exhausted climbing the mountain because:
A. He was out of shape.
B. The oxygen level declined as the altitude increase."
Even if you know the oxygen level declines as altitude increases or if it is IMPLIED, that doesn’t matter. What matters is what is said with these types of questions. If you got to say Line 17 and the skier says “I was exhausted because I was out of shape. I didn’t train enough…”, that’s the answer.
So you just need to learn how to analyze the tone and the content and the emotion.