i'll tell you straight up: psychology will be a bore unless you genuinely are interested in it/require it for whatever higher education path you wish to take
maybe read the bps (british psychological,,,society?) they have a newsletter with interesting cases if you're bored.
imo i wouldn't bother prepping for y12 lessons as per, maybe familiarise yourself with your spec. don't teach yourself the a level content now as it'll be hard and make you more bored when you come to learning it in year 12.