Dear Shubham, please check if your Board is in the drop down list. If yes, please select that. If NO, please check if there is an Option called "Others" . If there is an option called "Others", please select Others and see if you can manually write "Chhattisgarh State Open School Board". If you can, please write your school board manually and you will be fine. For step to step guidance as how to fill in the JEE Main Application form, please visit our page at: https://engineering.careers360.com/articles/how-to-fill-jee-main-application-form