All of the models and frameworks in the P3 syllabus are examinable and should be learned. Know each model well and most importantly, be able to apply it to the problem in a question. Many of the models are also useful as a framework of headings for an answer too.
It is a good exercise to create your own list of models and to then make your own drawing of each one. This process will help you engage with the P3 materials as you search for the models yourself.