eee
I have this theory that JAC, says that some people get 100% to motivate us.
I had this problem as well, I was getting 40%-70%, but I ended up getting in.
Just relax the last 7 days, do some work, not too much.
Finally before you go to the test, put on some music, put on something that you can remember and is catchy, so you can recite the lines of the song, while doing the test to soothe ur nerves.