The National Association of Secondary School Principals (NASSP) identified 34 high schools whose students maintained or improved their SAT scores from 1973 to 1976 or whose mean scores in 1973 were approximately the same as in 1965. In an open-ended questionnaire, the principals of these schools were asked to identify success factors. Their responses were placed under seven headings: (1) academic rigor; (2) English curriculum; (3) mathematics curriculum; (4) guidance programs; (5) grouping and grade weighting; (6) teacher attitudes and expectations; (7) parental and student attitudes and expectations. The schools attributed their success not to any one course or technique, but rather to a singular commitment to academic achievement for college-bound students--the belief that these students should face a moderately stiff curriculum, be counseled as to its value, be supported by parents and teachers in its attainment, and be tested on its outcomes. Data from the NASSP questionnaire and a related study by Gary Echternacht of Educational Testing Service suggested practical guidelines for English, mathematics, ability grouping, counseling programs, test preparation, students, parents, and professional staff. The Appendix includes a list of the 34 schools and a position statement for college mathematics preparation. (CP)