Science experiment: What would be the constants?

You are doing an experiment to see if increasing your study time improves your grade on your science exam. You have taken other science exams before and hope to do well. In this experiment, what would be the..... At least three (3) constants? I got "subject that the exam is on" for one of the... show more You are doing an experiment to see if increasing your study time improves your grade on your science exam. You have taken other science exams before and hope to do well. In this experiment, what would be the.....

At least three (3) constants?

I got "subject that the exam is on" for one of the constants, but what would the other ones be?
Thanks!
2 answers 2