Is this completely immoral?

Go to music class and get really sick with an extremely bad headache. Let the teacher be the one to send you home sick. Just keep grabbing you head and ask the teacher if she has anything for a horrible headache then run out of the room to the bathroom like you had to throw up then come back and tell the teacher you are feeling really sick and could you call your Mom to come take you home. Headaches are hard to prove you don't have if you can act really good like it is killing you.