self study help for AP

hey guys soo i'm an incoming junior and im taking 6 aps next year. i wanna self study for an AP test cause honestly it's kinda fun and it's not that serious IMO and i wanted ur guys' opinion on what's the easiest ap test to self study BTW i already self studied APES, and my classes next year are ap spanish, ap psyc, ap lang, apush, ap bio and ap calc ab!! ty