Hi Dhananjay, 

Do not panic, simply contact or visit your school. Your school authority will guide you how to go about obtaining another copy of your character certificate. 

Dear Dha Ajay Kumar 

You can get your character certificate  easily 

You can get it from your school.The character certificate is much important for your further educationan so take it from you school as fast as you can since if it take time it will dely for you admissions 

If the school suggest any objections please contact to CBSE office

Best of luck