Tallying a multiple choice test

Columns represent each student's test (There are 31 test numbers)
The test consisted of 50 multiple choice questions, each listed in each row. The green column shows the correct answer for each question.

I need to tally the score for each test in the orange row. How do I tally by checking each answer against the correct answer? (The three tan columns should have the highest scores) Thank you in advance.