Calculate GPA And Sort A Column In CSV File

I am having a hard time compiling this code: I need to calculate the gpa of each student in the csv file which looks like this:

ID First Name Last NameClass LevelDesired ClassCreditsPoints GPA
9410917 Reagan Walls SophomoreCOMP 18275 77 1.026667
13498070 Stewart Fry Senior COMP 10070 92 1.314286
37500410 Talon Witt Junior COMP 100107 389 3.635514
47845461 Ciara Beard Grad COMP 11097 196 2.020619

The GPA column needs to be added by dividing the points by credits. I also need to sort the class level column by class level. For example:

ID First NameLast NameClass LevelDesired ClassCreditsPointsGPA
9410917 Reagan Walls SophomoreCOMP 18275 77 1.026667
46309070 Ivy Valdez SophomoreCOMP 1006 16 2.666667
37405616 Miriam Welch SophomoreCOMP 11057 179 3.140351

Here is my code:

import java.io.BufferedReader;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.IOException;
import java.lang.String;
import java.io.File;
import java.io.PrintStream;
import java.io.Serializable;
import java.io.ObjectOutputStream;
import java.io.FileOutputStream;
import java.util.Comparator;

[code]...

I am taking the two things that needed to be outputted, one at a time. Working on the GPA portion.