What if I fail by a point?

I'm a senior in highschool and in the beginning of the yr I tried to get out of my precal class because it was too hard and my consular wouldn't let me. So 1st semester I had an avg 68.4 and this semester I need a 72 but I'm nervous (the way u avg a semester grade is 1st 9weeks grdx2 + 2nd 9weeks grdx2 + final exam/5) so I have. 71 and 75 avg and on my exam I just took I dont think I did very well. What if I fail with a 69? Will they have to bump me up to 70 for my avg?