Hello,

The supplementary GSEB exam is scheduled to be conducted in the second week of july. There is no notification released yet you can apply for the GSEB supplementary exam once they released the application form. Keep an eye on the official website for the latest information. Please click the below link to know more.

https://school.careers360.com/articles/gseb-12th-result

The notification for GSEB 2020 supplementary exams hasn't been released yet. The Notification might release in June/July and the exams might be held tentatively in the month of August. At this point in time, this is a tentative schedule. So you need to wait for an official information on this.