It seems from your diagram that Student and Topic are related by means of the relationships.
Consider Student 1 who is in Class 200 and Class 200 covers Topic 33 and Topic 34
In StudentsClasses there is a record with StudentId 1 and ClassID 200, and in ClassTopic there is a record with ClassID 200 and Topic 33 and a record with ClassID 200 and Topic 34.
So you create a query based on your relationships. Along these lines to find Topics by Student:
(there are other SQL options(Inner Join), but this is trying to show related fields)
Code:
SELECT Student.First, Student.Last,Topics.Topic
FROM Students, StudentsClasses, Classes, ClassTopic, Topics
WHERE
Students.StudentID = StudentClasses.StudentID AND
StudentClasses.ClassID = Classes.ClassID AND
Classes.ClassID = ClassTopic.ClassID
How do you know the Student attended a specific Class?
Good work of the diagram! Good luck with the project.