Need help, my best friend is having a mental breakdown.?

2 days ago me and all of my closest friends graduated middle school. the biggest score we can achieve is 40.00 and i got 34.35. And i think all of us were pretty happy and excited about our final results except my best friend named carrie. she only scored 29.30. i knew she worked and studied as hard as i did because we studied together in 3 whole months and she didn't even cheat THAT much. she graduated though, but with that score she can't even get in to any decent public schools. i called to see if she was okay but she's not. she said she's been crying all morning and she said she can't even get to any good school and she is considering home-school. well, home schooling is not a better choice in my country cause the tutors here aren't promising. i don't want this to crumble her future so i said maybe she can get into a private school that requires a test for enrollment so that she wouldn't have to worry about those final results again. what really sucks it i think all of those craziness has changed her to a totally different person. my 4 other best friends and i were celebrating our graduation by having a private dinner. we invited carrie along and she came alright, but she kept quiet most of the night and she's not going insane like she used to. when it comes to private occasions like this, she was usually the one helping around making dinner and making fun of me when i messed up. now she just sat on the couch looking glum. she never called me until now, even i feel when i talk to her she's not really listening. we were the craziest kids in eighth grade and we laugh and make fuss a lot. i really missed the old her. i'm afraid i might lose her. i've been friends with her since i was in preschool, way longer than my relationship with my other 4. two years ago, we both planned once we graduated, we'll go to the same high school. that high school we're after demands high results. i can get in all right, but it feels pointless getting in that school without her. we've been in the same class in our whole middle school life. all of my friends tried to cheer her up and talk her into taking a private school exam so that she can enroll to an even better school. and i'm asking you guys about what i can do to stop her from being depressed to suicidal. thanks before.