AN ACT GRANTING AN ADDITIONAL ACROSS THE BOARD TAX EXEMPTION FOR PUBLIC SCHOOL TEACHERS, AMENDING FOR THE PURPOSE SECTION 2(2) (A) OF REPUBLIC ACT 7167, OTHERWISE KNOWN AS 'AN ACT ADJUSTING THE BASIC PERSONAL AND ADDITIONAL EXEMPTIONS ALLOWABLE TO INDIVIDUALS FOR INCOME TAX PURPOSES TO THE POVERTY THRESHOLD LEVEL, AMENDING FOR THE PURPOSE SECTION (29), PARAGRAPH (L), ITEMS (1) AND (2) (A), OF THE NATIONAL INTERNAL REVENUE CODE, AS AMENDED, AND FOR OTHER PURPOSES