I have a dataset contains the answers from a multiple-choice test. The test includes 24 exam codes, each exam code has 50 key answers(A,B,C,D for 50 questions). Below is a corner of it, you can access the whole thing with the link I put at the end.

I want to count the number of each answer (ABCD) in each exam code. Here I plotted 2 exam codes like this:

How can I plot them side by side and change the order of answers in Python? I want the order of columns is "ABCD". (I've tried using plt.subplot, sns.factorplot but I keep getting errors).

Thank you.

Data link: