What to do with a fake friend?

ok I have this fren we both use to go to an all girls school we didint tlk ther ebut now we’re in the same class at this new school well shes exactly like me her birthday is the day after mine I know freaky but shes fake like REALLY FAKE but I can handle that the part I cant handle is that she’s an attention hog and I hate that ..she hates when pppl talk to me she want all theattention to her self and I know a lot of people so its hard to ignore my other frenz . the other thing I dont like is that she keeps downgrading me just because shes good in science and im not ..we get the same grades but yet she thinkz shes better than me . iknow shes not I have everything she dosent …anywayz what should I do with her caz we’re already close an I cant just stop tlking to her caz my other frenz are now her frenz and she hengz with them ..what should I do???