Im being hared by a guy,i went to fight him but he tried to hit me with a spanner. what should i do? ?

im 13(boy) in 9th grade and hes about14 in 8th grade . he says stuff like m.f****r and more and teases me in a very bad way. i tried to fight him but he brought a long spanner to hit !me what should i do?plz hlp