How to Compare the means in different scale

How to compare the GPA result with the pre exam result with 100 pt count of the same respondents about 200 people?
The data are of different scale, what statistical analysis can be done besides correlation?


TS Contributor
Can you provide a bit of context? Where are these data from, how does the pre exam look like, and what do you want to achieve or which research question(s) do you want to andwer?

With kind regards

From school , 4 different subjects about 200 people, just want to find out any significant improvement between the pre test (100 pt count) and the final GPA (1/1.5/2/2.5/3/3.5/4) only.