is it over for me

i'm in year 12 doing international alevels (bio, chem and maths) my exams start on the 8th of october so just a little over a month is left.

i'm a chronic procrastinator so i've barely revised. with biology, i've been getting mostly Bs but sometimes As in school exams. with maths, i've been getting mostly Cs and Ds. (this is without any major revision so i think if i try i can scrape a B) idk anything in chemistry and have been failing constantly.

is it possible for me to get three Bs with only one month of revision? if anyone has been in a similar situation as me pls i'd appreciate tips.