Queries :: Append Completed Courses To Another Table

I have created an append query to update completed courses to a previous education table.

INSERT INTO Education ( ID, [Qualification Name], [Level], [Date Achieved] )
SELECT Courses.ID, Courses.CourseName, Courses.CourseLevel, Courses.CertRecvDate
FROM Courses
WHERE (((Courses.CertRecvDate) Is Not Null) AND ((Courses.CourseCompleted)=True));

The theory here is if CourseCompleted checkbox is check and there is a value in CertRecvDate, the qualification has been achieved and therefore should be added to the previous education table (which will be used later for CV's etc)

The problem I face is I only want it to add any particular course once to the previous education table and not every time the query is executed. I am thinking I need to pass the CourseID field aswell to the education table and somehow check to see if that has been already added .

I have attached a screenshot showing the structure of the two tables.