Ultrasound technician education

Is anyone a ultrasound technician? For your core classes do you have to take every science? For example biology, chemistry, anatomy etc or can you substitute . If you aren’t good at chemistry can you take biology instead or if your better at chemistry can you take biology instead? Or do you have to take every single science?? Also is the pay good where you live? I live in FL & I’m looking into this but chemistry isn’t my subject