I've used the same pens since day one. (blue ink OptiFlow fine point from Staples) I only use it for tests. The rare occasions that I haven't used that pen, my grade wasn't as high as it normally is. A funny thing happened during one test, I was 3/4's through the test, using the pen I always do, and it ran out of ink, I didn't have another blue one but I did have black ink, so I used that. Got the test back, I got all the questions right that I used the blue pen for but I got a ton wrong on the questions i used the black ink pen. And when looking at the ones wrong, I KNEW those answers as soon as I looked at them, it wasn't like the last few ?'s were hard or I didn't know the answer!! I also make sure I wear my engagement ring and another special ring my hubby gave me. Again, if i didn't have one or both on, my score on the test wasn't at the level it usually is.
And finally, I ALWAYS ask the teacher passing out the tests for an odd numbered test. Now, the teachers KNOW to give me an odd numbered one. LOL
So far using the pen on odd numbered tests while wearing both rings has gotten me to a 3.8 gpa