DO MEMO NO. 159, S. 2021. SPECIFIC INSTRUCTIONS ON THE RECENT POLICY ISSUANCES FOR SCHOOL YEAR 2020-2021 Posted on June 25, 2021 by DepEd Mandaluyong Leave a comment DO MEMO NO. 159, S. 2021. SPECIFIC INSTRUCTIONS ON THE RECENT POLICY ISSUANCES FOR SCHOOL YEAR 2020-2021 Memorandum Numbered