Thanks for the feedback Holixx.
I was already wondering if I had too much text in there, so I will shorten it and check it for mistakes.
I used the colours to show when a new project starts. I only used 3 colours so after a while it will be repeated. I might consider making the colours less visible or stick to one.
My portfolio cannot be longer than 20 pages due to the restrictions from the university where I am applying to.
Edit:
I updated my portfolio again. I decided to remove 1 school project and give the other projects some more space. Each project has its own colour, which also was helpful for the table of contents.
I still need to work on the texts, most of them are just fake text.