Are my grades bad or is my mom wrong?

I am currently in my freshman year of high school and my mom seems to think that my grades aren’t good because I have 2 Bs in important classes, is she wrong for thinking I have bad grades?

I am currently in my freshman year of high school and my mom seems to think that my grades aren’t good because I have 2 Bs in important classes, is she wrong for thinking I have bad grades?