Summer Subjects for Psych

So as summer has now approached I am now going into 6th form in September. (I am 17 who’s just starting 6th form for separate reasons.) Wanting to study psychology at university I am also (hoping) to do a level maths, psychology and physics. Since I have nothing to do this summer I’m trying to find subjects to learn that may benefit me. I have done open university free courses and read a couple psychology books but other than that I’m stumped. Statistics may be an option, but was wondering if anyone had any other suggestions as I would also love more to put on my future ucas!