2022SystemDecember 9, 2022From 18:00 p.m. on Dec. 12, Our website will be downCloseNovember 24, 2022The CHSSL will be closed on Dec. 14-16.NewsOctober 7, 2022Study Series No. 80 is availableNewsApril 1, 2022Study Series No. 79 is availableImportantApril 1, 2022CHSSL’s Services from April 1st, 2022 (Update May 31)