Can somebody please help me with an explaination about the difference between

• course prerequisites
• course entry requirements
• course qualifications

This is about a course which consists of different modules. To start with the course the candidates must have some qualifications (or entry requirements?) For every module the prerequisite is the candidate has succesfully ended the previous module.

Is this correct? What is the difference between those three? (if there is any difference)

Thanks in advance