school management

hello I have the source code of a web application and I would like to make changes 1- is it possible to create subjets by group? for example group Science=(Mathematics,Physics,chemistry,biology) art=(french,english,history) 2- if possible display the rank by subject and average 3- to the new notes I would like to add the coefficient What does coef mean? all disciplines do not have the same importance depending on the series chosen by a student. to materialize it, the teachers assigned coefficients to each subject. Thus, the higher the coefficient of a subject, the more important it is for that class. After each assessment, a student's mark is put out of 20, then multiplied by his coefficient to calculate his overall average. Coefficient is: A number used to multiply a variable. Example: 6z means 6 times z, and "z" is a variable, so 6 is a coefficient. 3- finaly the most important is it possible to have a bulletin similar to this one? sample bulletin we want to have [login to view URL] or [login to view URL] here is what i have now [login to view URL]