How to make matlab code to calculate the grades for each student ? as a matrix?

I have an xls file that has the student ID and his marks ( total 5 colom )

You are required to write a Matlab code that performs the following: 
•  Reads the data from the file and stores it in appropriate matrices 
•  Calculate the marks for each student and determines his course grade (A+,A,….) 
•  Make a pie chart showing the percentage of students in each grade category. 
•  Determine the student(s) who receive the maximum grade

[Ngoc]

Have you attempted the problem? I am willing to work with your code if you show me your progress thus far.

[Stephen23]

We are not automatic homework solvers. You need to show us what you have attempted, and what specific coding problems you have. The more you try yourself, the more you will learn from your course...