Master/Detail form (urgent)

i have an access database that i want to connect to with delphi.
There are 3 tables
Students{Id*,Name,Surname)
Subjects{Code*,Description}
Overall{Id*,Code*,Exam1,Exam2,Exam3,Exam4,Average}

my form should have a master and a detail.
The master should consist of student details, and the details should consist of the marks of the different subjects for a particular student. How do i also calculate the average here?

Help urgently!


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