Hi! Year 13 Psychology student here…I have found that a lot of Psychology A level is research methods (40% of the exams!!) and this is mostly made up of stats tests, experimental designs and ethics. In terms of science, the amount of scientific processes you need to know is minimal, as it only really comes up in one topic and the only process is synaptic transmission, which is worth maximum 6 marks. It depends on what exam board you do- but for AQA there is lots of research methods and not much science.