All perfect praise be to Allah, The Lord of the Worlds. I testify that there is none worthy of worship except Allah, and that Muhammad is His slave and Messenger.
It is confirmed that a man came to ‘Abdullaah Ibn ‘Abbaas and said: "O Ibn 'Abbaas! I am a human being and my sustenance comes from my manual profession and I make these pictures (or statues)." Ibn 'Abbaas said: “I will tell you only what I heard from the Prophet . I heard him saying: “Whoever makes a picture will be punished by Allah till he puts a soul in it, and he will never be able to put a soul in it.” Then Ibn 'Abbaas said to him: "You can draw the picture of a tree or anything that has no soul.” Nonetheless, some scholars permitted the drawing of living beings provided that one leaves out a vital part of that creature without which life is not possible, like if it has no head, as Ibn ‘Abbaas narrated that the Prophet said: ''The picture is the head. If the head is left out there is no picture." [Al-Isma’eeli and Al-Albaani]
Therefore, if you are in necessity to draw a living being, like a human being or an animal, then you may do so while leaving a vital organ of that being that leaves it lifeless.
You could also explain to the school that your religion forbids drawing living beings and we hope that they will accept your excuse, and you may show them this Fatwa.
Allah knows best.