how am i suppose sit for exam next week ?

i am soo worry my exam now... today i got back my Stat pratice paper that i did last week...i got not achieved...haiz...i really worry my exam the end of the year now...especially next week exam....next week is the trial exam already.. and now i still getting this result... how can i sit for the exam next week??

now, Calculus is the only subject that i confidence. not Stat and accounting...i know what to study in Calculus... but not Stat and accounting..i really dunno how to start revision...Accounting even worst... i have no idea what to study at all... how... what can i do now ???