Using a computer
Besides other things, a computer offers the opportunity to organise, reorganise, and delete material, without having to write everything out every time you make a change. It also allows you to make notes as you go along, file them easily, and add and update them in your revision period.
You may even find that one of your software packages supports a facility for making notes. You will certainly have a range of layout facilities and graphics to enhance your notes.
Make a list of what programs or ways of making notes you could use.