I have a mysql database. One table is called "students" which list all the students' information, like address, phone number and so on. Every month students have a quiz and get the grades. I want to input the grades in the datbase, because I want to each student using his or her username and password to login the "grade" page to view his or her own current grades and also can view his or her own passed the grades on the internet. How could I store these grades for each month? Another thing is that in future I would add more students in the database. Another words, the database will expend in the future. Please give me some suggestions.