It´s a good idea to write on a loose piece of paper in class and then copy everything nicely at home. If it works for you, divide your notebook into sections specified below. It also helps to have a binder or a file (files) for all the photocopies and your writing assignments.
> Pronunciation (collect words difficult to pronounce)
– words with their translations (in two columns)
– words with their definitions
– word families (believe, belief, unbelievable)
– thematic groups (lungs, kindeys, liver)
– collocations (you can also divide expressions according to their structure, for example those focusing on prepositions – together)
– collections for the Use of English part of your exam
> Grammar (tables, diagrams, collections eg. for inf/ing)
> Writing (structure and expressions for each kind of writing separately)
In case of CAE, the genres are: essay (obligatory), different kinds of letters, proposal, report, review.
> Speaking (especially for exam students)
In case of CAE, you need expressions for comparing, describing, speculating, exchanging ideas, expressing and justifying opinions, agreeing and/or disagreeing, suggesting, evaluating, and reaching a decision through negotiation.