Stressed?

Hey Guys!
So recently, I have been studying the SAT for the past month or so. While completing the blue book, I have greatly improved on my critical reading section from getting half of the answers wrong to getting ~2 or 3 wrong at the max. I went on a mini vacation during the three day weekend and when I came back, I started doing SAT prep again. What confused me was that I was getting half of the answers wrong again. Do you think it’s due to stress or something else? SAT’s are next Saturday and I’m freaking out because I was really confident on my CR section, but now i’m not.

Any feedback would be greatly appreciated!
-Wilson