Hey,
Psych is not that difficult to swap into four 3&4. I've made a thread in the psychology section of the forum which outlines what you should learn over the holidays if you haven't studied units 1&2 (spoiler alert: it's basically research methods).
What do you mean by not enjoying research? Do you not like conducting or analysing experiments? Do you not like looking stuff up?
Psych 3/4 focuses on these things:
- the nervous system (how do voluntary and involuntary responses work on a biological level?)
- stress (fear & excitement, causes of stress, biological & psychological impacts & processes)
- Learning and memory (types, how it works from a bio & pdych perspective)
- conciousness (awareness, attention, how we measure it)
- sleep (why, how, components, how it changes, impacts of sleep deprivation and sleep disorders)
- mental wellbeing (the spectrum of mental wellbeing, factors that influence mental health disorders, anxiety disorders, treatments)
- like psych 1&2 there are also overaching things about psych as a science you need to understand (biopsychsocial model, research methods (inc. ethics) )
Hope this helps!