If you find yourself in the unfortunate position of not being treated fairly by your school in the sense of other students being in the same position as you and being treated differently, say, you receiving or potentially receiving a more severe sanction or outcome. You need to take the necessary steps with the school. The concerns have to be expressed to the school. The school needs to be put on notice as to the fact that it's not acting fairly or appropriately.
If you're at a stage in the process where a decision has already been made, it may be a matter of appealing it to argue that it's a disproportionate or unfair sanction. You should never go through the process alone. You can't depend on the school to do the right thing. It's not an unusual situation where one student is, say, accused of the same misconduct as others and they receive a more, say, severe penalty that, say, all circumstances being the same should not be taking place, but it can.
That's why having an experienced attorney-advisor in your corner can help you best protect and understand your rights and can help you best navigate the process to try to avoid such a potential scenario. They should be involved as early as possible in the process.