Online result process system

Question

Hello

My Project is Online Result Processing System in asp.net using C# there is problem/confusion about database Design and architecture

 

there is three module

1. Admin

2. Authorized Staff

3. Student

 

Admin Actions

 

Add/Update Staff

Add/Update Student

Update Own Profile

 

Staff Actions

 

Add/Update Student

 

Update Own Profile

Fill Student Result In Student Exam Result Form

 

 Student Actions

 

Enter PRN No and Clicks on Submit button and see the whole result..

 

then i want when Staff enter PRN inStudent Exam Result Form then all the Subjects can be fetch from DB which is Given PRN gives exams of all subjects For example I am Giving FY Second semister(Sem) and my first sem 3 subjects are fail then second sem all subjects and first sem 3subjects are also fetched when the staff enter this PRN  

please suggest require database for this system