what happened to me???

i am done a bad thing that i cant fix it back. yesterday night i thought i got study is enough to facing the midterm but early in the morning i over sleep and late for the mid term test and when i got the question paper my mind or can said all i am memorize lost my brain stuck because i am nervous.after that i realize that i am even dunno what happened to me.i keep playing and playing and din study at all.until now can said i din have basic of account subject and playing in the class making me dunno how to do.how i am gonna maintain my cgpa???who can help me????my head suffering now.