If a student is charged and found responsible for giving unauthorized assistance to another student, the penalties can vary. It could be anything from a warning to probation, to suspension, to expulsion. It will depend on the particular circumstances and facts of the case in terms of how the nature of the allegation or what took place that is, how egregious the allegation or situation was, it will also depend on the student's particular circumstances.
An undergraduate student is held to a high level of accountability, a graduate student, a PhD student, a student in professional school be it law school or medical school, will be held to a higher standard yet. The sanctions can be very serious. Fundamentally, you need to prepare the necessary response to the school. Did you in fact provide unauthorized assistance or are you being wrongly charged? You shouldn't put the cart before the horse and expect a negative outcome, especially if you could take the necessary and best steps forward to address the matter. Having an experienced attorney advisor would be your best ally to help you understand and navigate the process.
