A level sociology course

Hi guys so im in year 12 and did 3 as levels this year, i enjoyed learning biology but my teachers ruined it for me and so i am dropping the subject and swapping it for sociology but im doing the year 12 content over the summer and joining the year 13 class this september so that i dont have to stay a year back. i was just wondering since weve started crime and deviance already, how the hell do i answer 40 markers? i dont know any of the foundation content but ive joined the year 13 class already and we are learning the topics already, but i have no clue what any of this stuff means because i dont have the foundational knowledge. ive started learning y12 content but i just have a lot to do so im wondering how difficult is it and how the hell are u meant to even revise or prepare for 20/40 markers??