(a) For classes graduating from 1988 to 2003, inclusive, no local or regional board of education shall permit any student to graduate from high school or grant a diploma to any student who has not satisfactorily completed a minimum of twenty credits, not fewer than four of which shall be in English, not fewer than three in mathematics, not fewer than three in social studies, not fewer than two in science, not fewer than one in the arts or vocational education and not fewer than one in physical education.

      (b) Commencing with classes graduating in 2004, and for each graduating class thereafter, no local or regional board of education shall permit any student to graduate from high school or grant a diploma to any student who has not satisfactorily completed a minimum of twenty credits, not fewer than four of which shall be in English, not fewer than three in mathematics, not fewer than three in social studies, including at least a one-half credit course on civics and American government, not fewer than two in science, not fewer than one in the arts or vocational education and not fewer than one in physical education.

      (c) Any student who presents a certificate from a physician stating that, in the opinion of the physician, participation in physical education is medically contraindicated because of the physical condition of such student, shall be excused from the physical education requirement, provided the credit for physical education may be fulfilled by an elective.

      (d) Determination of eligible credits shall be at the discretion of the local or regional board of education, provided the primary focus of the curriculum of eligible credits corresponds directly to the subject matter of the specified course requirements. The local or regional board of education may permit a student to graduate during a period of expulsion pursuant to section 10-233d, if the board determines the student has satisfactorily completed the necessary credits pursuant to this section. The requirements of this section shall apply to any student requiring special education pursuant to section 10-76a, except when the planning and placement team for such student determines the requirement not to be appropriate. For purposes of this section, a credit shall consist of not less than the equivalent of a forty-minute class period for each school day of a school year except for a credit or part of a credit toward high school graduation earned at an institution accredited by the Department of Higher Education or regionally accredited.

      (e) Only courses taken in grades nine through twelve, inclusive, shall satisfy this graduation requirement, except that a local or regional board of education may grant a student credit (1) toward meeting a specified course requirement upon the successful completion in grade seven or eight of any course, the primary focus of which corresponds directly to the subject matter of a specified course requirement in grades nine to twelve, inclusive; (2) toward meeting the high school graduation requirement upon completion of a world language course offered privately through a nonprofit provider, provided such student achieves a passing grade on an examination prescribed, within available appropriations, by the Commissioner of Education and such credits do not exceed four; (3) toward meeting the high school graduation requirement upon achievement of a passing grade on a subject area proficiency examination identified and approved, within available appropriations, by the Commissioner of Education, regardless of the number of hours the student spent in a public school classroom learning such subject matter; or (4) toward meeting the high school graduation requirement upon the successful completion of coursework at an institution accredited by the Department of Higher Education or regionally accredited. One three-credit semester course, or its equivalent, at such an institution shall equal one-half credit for purposes of this section.

      (f) A local or regional board of education may offer one-half credit in community service which, if satisfactorily completed, shall qualify for high school graduation credit pursuant to this section, provided such community service is supervised by a certified school administrator or teacher and consists of not less than fifty hours of actual service that may be performed at times when school is not regularly in session and not less than ten hours of related classroom instruction. For purposes of this section, community service does not include partisan political activities. The State Board of Education shall assist local and regional boards of education in meeting the requirements of this section.

      (g) A local or regional board of education may award a diploma to a veteran of World War II, pursuant to section 27-103, who left high school prior to graduation in order to serve in the armed forces of the United States and did not receive a diploma as a consequence of such service.