On each slides doc you will see a variety of examples of each area of your sketchbook. Use these as inspiration and when you are not sure what to include on a page. Remember sometimes less is more and that presentation of your work should be carefully considered.
It is not always about filling a page, sometimes having less on the page so the focus is on showing off the quality of the work that is there is key.
This is an example of an A-level equivalent sketchbook with the theme "Architecture". This student was also studying Fine Art at A-Level so please don't be put off by his drawing skill! He went on to study Fashion Design at university. This is a good example to look at for page layout and continuity- the development of this project is strong as his ideas evolve as he does more research and testing.