You need an attorney. The problem here is that you are now facing the time you would have gotten on the obstruction charge as well as whatever else you are being charged with now. The judge will take into account all the factors, including the fact that you are in school. However, an attorney is your best bet if you want to stay out of jail.
I am a licensed attorney in the state of Nebraska. However, the advice I give here is not to be taken as legal advice. It is merely my opinion based on the limited information given. In order to assure that your legal rights are being properly represented I would always recommend going in for a consultation with an attorney to explain your case in detail and answer any questions the attorney might have.