As some people are looking at grading at the end of May, here is a link to part of the British Kendo Association website:
http://kendo.org.uk/kendo/grading-requirements/
It states very clearly what is looked for by examiners at each level of grading. It is good to look at this even if you have not yet registered for a grading as it will give you an idea of what to work for, and at which point you should be thinking about taking a grading!
Additionally the questions (Grading questions- Kendo) and other requirements are also worth a look at ("Gradings").
See you at practice!