Is it illegal to go against a given curriculum?

No, it is not illegal to go against a given curriculum. However, it may have consequences, such as not meeting the requirements for a degree or certification, or not being able to transfer credits to another institution. Additionally, some schools may have policies in place that require students to follow the curriculum as outlined, and failure to do so could result in disciplinary action. It is important to carefully consider the potential implications before deviating from the prescribed curriculum.