Depending on the rules that are applicable to you, you may have to challenge your suspension in the appropriate court or tribunal. You have mentioned about CBSE school. But, it can be central school, a school under some state government, or a private school and that too it depends on in which state.
Depending on all these aspects, the relevant rules applicable to you would be different, as each state has different set of rules and within the same state also, different rules may be applicable to private schools.
My advice to you would be to contact some local lawyer at your place and consult him along with the relevant rules that are applicable to you. It may not be possible for an outsider to know about the relevant rules. Depending on the rules applicable, you can consider taking necessary action by approaching the appropriate court or tribunal (for example, if it is a central school, then the case may go to Central Administrative Tribunal or CAT).
You can check from your rules whether there is a provision for review of suspension periodically, i.e., after every 3 months or 6 months; and, also whether there is a time limit for initiation of disciplinary proceedings after order of suspension.
If the decision in the departmental enquiry is pending (though you said that you could not be found guilty), you can wait for some reasonable time for that.
You may please also a relevant judgment of the Supreme Court, which I have covered in my article: Suspension order not to extend beyond 3 months if charge-sheet is not served, says Supreme Court. This judgment was with regard to a central government employee, and it may or may not be applicable in your case, depending on your rules, but it will give some idea about the basic principles on this issue.
Dr. Ashok Dhamija is a New Delhi based Supreme Court Advocate and author of law books. Read more about him by clicking here. List of his Forum Replies. List of his other articles. List of his Quora Answers. List of his YouTube Videos.