Never. A template of essay or speaking may work well with an examiner if he or she values it for the first time. However, if she / he gets to mark the same second time, your chance of scoring high in the test will be very less. Nevertheless, it might affect your scoring dangerously...
Being an online editor, Overleaf also allows you to share and collaborate on documents with other people. This is useful if you are working on an academic article with multiple people and you want a single place for writing. Further, Overleaf also works with schools to provide a template for...