Hello there. Hope you are doing good. I would like to tell you that the Assam Board has officially released the date sheet for 2020 Board exams. The exams will commence from February 10, 2020 with English as the first exam. I am sharing the link of official pdf released by Assam Board. You can check it from below:-

https://sebaonline.org/admin/notice_uploads/Notice_149_time_table_2020.pdf

I hope you found this answer helpful. Good luck for your future.