Hi there, I'm a bit of a whizz kid at Psychology. I got almost full UMS in GCSE Psychology (Two or three marks off full marks) and I got 194/200 UMS for my AS in Psychology and I'm currently in A2 Psychology on board to try and get full marks this time round.
I got my grades thanks to God for giving me the ultimate tip: Organisation and Removal of excess information
Grab your specification and follow that strictly to make your own notes AND make sure you try to use all mark scheme notes wherever possible. ONLY use a textbook when the mark scheme can't fulfill that specification point.
Regular studies should follow the Aim (2 marks), Method (6 marks), Results (4 marks), Conclusions (2 marks). I wrote the number of marks indicating that that much detail should be included in your notes. eg Methods for any study should have 6 distinct points as a minimum.
Also, if you're lucky you may get to get all of these marks in your notes just by using the mark schemes alone. (Mark schemes guarantee you a mark whereas textbook marks may not).
Case studies follow a different format:
Aim (2 marks) and case description (6-8 marks) and case analysis (6 marks). The description is essentially what the story is (in brief) and what the researchers had done to the subject. The analysis refers to the observations made and most importantly, what conclusions can be made and what lessons can be learnt from this study.
Do not include any information in your notes that go beyond the "mark limit" for example for a 4 mark results, do not add 6 or 7 points as 4 is enough to get you the mark. Always include a back up mark in case you forget one of them in the exam so put enough info for 5 marks!
Memorise notes by constantly rewriting them; I assume that the third rewrite of your notes should embed it into your head and the 4th one should confirm. After that, get someone to test you on one or two pages everyday and OOOHH don't forget to always always use abbreviations where you can and include bullet points. This makes the information easier to take in.
I hope this helped!