Personally, i found some concepts in psych a bit hard i.e. elizabeth eye witness testimony fallibility (did unit 3 and 4 last year and got a 40-i was expecting a 20-25) but if you try to think about the concepts from a simple, logical perspetive, it becomes a bit more easier. if u read it over that concept a couple of times, draw a couple of flow charts, watch videos (which i didnt find useful but u may try it), do a couple of questions on it (i.e. from vcaa) and memorise the answers that vcaa has given (which was really helpful for me lol), it simplifies it a bit and starts to make sense. Yes some concepts in psych can be pretty complex, but i dont think u should have that much trouble with other concepts u will come across the year as they are pretty straightforward if u think about it. if u do have trouble, i suggest u see ur teacher asap or seek help, its never too late! they can help u understand the concepts u r struggling with better