Sorry been off dealing an adjudication - which I'll post about shortly.

I'm assuming you're finishing secondary school and have some kind of art or design material to show?

I think there are a few things to cover in a portfolio: obviously some kind of artistic knowledge but you don't have to be an expert- just showing interest in say colour, form, perspective etc. Show exploration of a subject - depth of exploration is good rather than just skimming the surface of a subject. Showing how you've made decisions: if you can draw anything how did you decide on what to draw/ model etc? Rather than say, I thought it looked good, what I fluency your choice. Showing a diverse range of I fkuences is good : artist case studies, poets, engineers, archaeologists- we had students who were coming from backgrounds like maths and history degrees. Remember you're going to uni to learn architecture so you're not expected to know it all now but Showing interest and the thought processes I've mentioned above is good .

Make your pages clear and free of clutter so at a glance one can understand what it's about - a visual hierarchy will show you can organise thoughts and not just fall into making graphics.

If you upload some portfolio pages we can all comment