The difference between TEF and DELF is that TEF score expires after 2 years while the DELF/DALF diplomas do not expire. Also, If you pass DELF B1 you get a B1 certificate and there are DELF exams for each level while TEF decides your level depending on your results. You can choose the test according to your requirementThank you for your response. It turns out that there is also DELF or DALF which are diplomas apart from other options. TEF and TCF are tests. I just want to make sure that I am preparing for the right test.