Student grades query of two courses

Question

Hi everybody
I need some advices from experts. I'm trying to make a suitable database for students grades. I'm a bit confused in how to gather all grades of each single student into one from. let say that the students have two courses, where each course has 4 tests. The
4 tests of the two courses are summed separately, so we will have two total grades. Finally, the average of the two grades is considered as the final grade. Here I would like inquire, should I create one query for all grades or it is better to create a query
for each course grades then create a third query to gather the two queries. Note that I need to print out the first course grade (including the tests ). Also, In the second course I will have to print out the whole grades in details for the two courses. 
Any help please.
Thanks in advance.

Answer 1

Amending the model for one of my online demos, StudentCouses.zip in my public databases folder at:
https://onedrive.live.com/?cid=44CC60D7FEA42912&id=44CC60D7FEA42912!169
to include tests gives the following model:
With this the final grade per student can be returned with the following query:
SELECT StudentID, FirstName, LastName,
AVG(TotalGrades) AS FinalGrade
FROM
    (SELECT Students.StudentID, FirstName, LastName,CourseName,
     SUM(StudentCourseTests.Grade) AS TotalGrades
     FROM (Courses INNER JOIN Tests ON Courses.CourseID = Tests.CourseID)
     INNER JOIN (Students INNER JOIN StudentCourseTests
     ON Students.StudentID = StudentCourseTests.StudentID)
     ON (Tests.CourseID = StudentCourseTests.CourseID)
     AND (Tests.Test = StudentCourseTests.Test)
     GROUP BY Students.StudentID, FirstName, LastName,CourseName) AS sqTotalGrades
GROUP BY StudentID, FirstName, LastName;
It would be a simple task to create a report based on the tables and return the individual grades per student per test, along with the sums of grades per test in a group footer, and the final grades in a subreport based on the above query.
Ken Sheridan, Stafford, England
Ken Sheridan,
That is great. However, can I make a class table and then the link it to the student table as (one to many )?