Calculating the average of student

Hello there everyone,

I am having problem with this question: Given a list of test results (each with a test date, Student ID, and the student’s Score), return the Final Score for each student. A student’s Final Score is calculated as the average of his/her 5 highest test scores. You can assume each student has at least 5 test scores.

Now, here is the thing. I do not want the answer.

I tried the hashing, but hashing can provide key with addresses so it did not work for me. I thought of using array list the iterate thought to calculate the average and return the top five score, but how do I assign the numbers with the studentID ? such as, say I want the output to be: Mike, 15. Is not this what the question requires ?! to get the student ID and the average number. Please, help me out with some clues, I am learning.

Thanks,