I am confused because in the maths B paper we are allowed to carry a HB pencil though the instructions read that use a black ink or ball point pen. Moreover if i accidently plot the wrong points on the graph how am i supposed to correct them.....

That will be for graphs, you are supposed to answer all the questions in black or blue ball point pen, and plot graphs in pencil, as it is so easy to make a mistake

Make sure you remember to switch back to a pen after doing the graphs though!!!