My doing my engg 3rd yr...sem exams r coming ... hv 13 arrears...i need 2 clear them?

bcoz only 2 semesters r remaining...but i am unable 2 concentrate in studies.i was an average student n school...but as soon as i joined d college my concentration power was reduced....i want 2 clear my papers...only 4 days r thr 4 me....my xams vl start now...plz suggest me sme tips 2 concentrate i buks..! whenever i take d buk my mind gets diverted..! i need immediate help..!