Hi can someone help me to solve this problem :

Create a program that would compute the grade of a student. This would ask for the name of the student, the overall total of written test, performance task and quarterly assessment. Afterwards, it would for the total score of the student in written test, performance and quarterly assessment.
The system would compute the grade and would display the final grade and remarks of the student.

No, we can't solve "this problem", since this is not a problem, it's an assignment.

go over your course notes, and check what concepts you 'll need to use. Have you seen inheritance yet? if so, you'll probably need to show it off.
You'll need to use conditional statements, either a Scanner object, or JOptionPane inputboxes, or create your own.