Central saint martins portfolio preparation

Hi!
Im working on my portfolio currently to apply for central saint martins foundation in 2022. I have projects im doing at school as well as a couple im working on at the moment at home in sketchbooks etc. Im wondering..:
1. if portfolio application is done online again (using pebblepad) will you be able to also add sketchbooks somehow or will it be solely on your A1 final pieces
2. how A1 sheets will be required and how much freedom do we have with those? I've seen some people say just stick a piece of work onto the sheet but if i wanted to be a bit creative like collaging on the page is that not allowed?
3. if you've applied before, other then sketchbooks and the A1 portfolio sheets is there anything else people often bring in like if i made a piece of clothing would I bring it or just have a photo of it?

i think thats all for now sry im stressing!!