How can I get my girlfriend to relax?

My girlfriend is 18 and works 2 jobs and she's worried about her math class cuz she failed a test and she has a 73 in the class and thats going to drop she talked to her councilor about how she asked for help on the test and the teacher denighed her help.. Her councilor reccomended tutoring and her councilor also told her thatnif she doesn't pass this class she won't be graduating with her class.. I've been trying to calm her down and telling her how just her failing one test won't drop it that much especially with it being close to the end of the year, vie given her massages and what not but that dissent help... If u recommend sex that wont happen shes afraid of getting pregnant with having a condom in and her on the pill... I mean idk what to do vie tried talking to her about it today cuz I could tell something was wrong so I asked her what was wrong and she said stressed I ended up asking her about what she said work, parents, school... I'm trying to get her to relax but idk what to do can someone please help!!!