About 9,000 seniors are graduating from Montgomery County's public high schools this week and next. Many have excelled academically and in school and community activities. Here is a list of the top-ranking students, whose grade averages are 4.0 -- straight A's -- unless otherwise noted. Some have better than 4.0 records, having added to their averages by scoring highly in advanced placement courses. Bethesda-Chevy Chase

Jed Gaylin, with a 3.97 grade-point average (GPA), is No. 1 in his class. He plays the piano in the orchestra and band, and accompanies the school choir and musicals. Gaylin is taking a piano course at American University and has written compositions for orchestra. He also is a National Merit Scholarship finalist and has won a Yale Book Award. He has a part-time job as an office aide, and tutors other students. He will attend Oberlin Conservatory of Music at Oberlin College, Oberlin, Ohio. Montgomery Blair

Greg Lyons is senior class vice president and editor of the school newspaper. He belongs to the National Honor Society (NHS) and the French Honor Society and was a semifinalist in the Maryland Distinguished Scholarship competition. He has been named to the Century III Leaders Program of the National Association of Secondary School Principals and has been awarded the University of Maryland's Chancellor's Scholarship. He will attend Maryland or the University of Pennsylvania.

Martha Yeide, a member of the NHS and the German Honor Society, has been active in Keyettes, a service club, and is on the stff of the literary magazine. She has received a Maryland Distinguished Scholarship award and a commendation from the National Merit Scholarship program. She participates in musical activities and is on the pompon squad. She will attend Davidson College in Davidson, N.C. Winston Churchill

Scott Behrhorst is treasurer of the NHS. He plays guitar in the school's jazz ensemble and in the Zone City Blues Band. He enjoys volleyball, racquetball and swimming. Behrhorst has received the Marshall Hahn Engineering Merit Scholarship, an award of $1,000 for the first year of his engineering studies at Virginia Polytechnic Institute in Blacksburg, Va.

Michael Cassidy has been selected by his fellow seniors to give the valedictory at commencement. He has won numerous honors, including the Bausch & Lomb science award and the school music department's Louis Armstrong Award for top jazz musicians. Cassidy, a pianist, has been named to the all-county jazz group and also plays with the Zone City Blues Band. In addition to piano, he plays banjo, guitar, string bass and viola. He will attend the Massachusetts Institute of Technology in Cambridge, where he may study aerospace engineering. Cassidy has been offered an Air Force ROTC scholarship, but has not yet decided whether to accept it.

Any Dubner plays in the school's jazz ensemble and mixes sound for the Zone City Blues Band. He is on the math team and tutors other students in chemistry. Dubner also acts and sings in school plays. He will attend the Massachusetts Institute of Technology.

Teresa Felver, a member of the NHS, is interested in design, tailoring and modeling. She was the designer of the wall decor in the children's ward of Shady Grove Hospital. Since she began working at Hecht's seven months ago, she has received three productivity awards for outstanding sales. In her leisure time she plays volleyball, soccer and tennis. She will study chemistry at Duke University, Durham, N.C.

Mark Khoo declined to be interviewed.

Frank Park, who lived in Korea seven years, is on the math team. He enjoys writing and keeps a journal. He is interested in anthropology and sociology, but wants to study electrical engineering. He plays soccer, tennis and ice hockey. He will attend Massachusetts Institute of Technology.

Janice Veron has maintained a 4.0 GPA despite several leg operations following a fall last year. She is in the Spanish Club and is the school photographer. She will be one of two Maryland representatives at the National Youth Science Camp in West Virginia this summer. She will study veterinary medicine at Cornell University, Ithaca, N.Y., and has been accepted in the National Zoo's Animal Management Training program. Damascus

Grace Mueller, an NHS member, is president of the Thespian Society and played leading roles in two school plays this year. She is a National Merit Scholarship finalist and has received a Maryland Distinguished Scholarship award. She will enter the Oberlin Conservatory of Music at Oberlin College. Albert Einstein

Karen De Haven has a 4.0 GPA. She was nominated for the University of Maryland's Chancellor's Scholarship and has received the Maryland Distinguished Scholarship award. She also was nominated for the American Awareness Award given by Fairchild Industries. De Haven is active in track and cross-country and has run the marathon in less than four hours. She also is captain of the swimming team. She will attend the University of Maryland.

Laurie Yuan also has a 4.0 GPA and has received a Maryland Distinguished Scholarship award. She studies karate and collects stamps as a hobby. She wants to be a physician, and will enter Cornell University. a Gaithersburg

Mary Deiphaus has a 3.97 GPA and is vice president of the NHS. She won a Maryland Merit Scholarship award and the school's science award. She plans to attend Duke University. Walter Johnson

Michael Higgins has won both the Maryland Merit Scholarship award and the school's Outstanding Scholastic Achievement award. He has appeared in seven plays at the Round House Theter and in three films. He also has taught acting for three years. His other interests include jazz and classical music, and poetry. Higgins plans to study drama and French at Amherst College, Amherst, Mass.

Margie Lou Homer was a finalist in the American College Scholarship competition and the Maryland Distinguished Scholarship competition. She won the school's George Washington Engineering Medal for excellence in the study of mathematics and science. Homer was copresident of the debate team and a member of the French Honor Society. She plays piccolo, recorder flute and string bass in the school orchestra and also is active in intramural volleyball and basketball. She will attend Swarthmore College in Swarthmore, Pa.

Randall MacLowry won a commendation from the National Merit Scholarship program. He also won the Williams Book Award. MacLowry is a member of the school's thespian group and has appeared in several productions. He also has been a student government representative. His athletic interests are skiing, swimming and weight lifting. He will attend Wesleyan University in Middletown, Conn.

Mohan Nadkarni has been named a National Merit Scholar and also has won a Maryland Distinguished Scholarship award. Last year Nadkarni was nominated by the school to be a junior member of the National Academy of Sciences. He also has studied in Scotland as an exchange student. Nadkarni is a member of the Student Government Association, the Spanish Honor Society and the "It's Academic" team. He plays basketball, baseball and tennis. He will attend Harvard University in Cambridge, Mass.

Richard Schulick has received the Maryland Distinguished Scholarship Award, Bausch & Lomb science award, Montgomery County Heart Association Student Research Fellowship Award, Mathematics Association of American Outstanding Performance Award and the National Institutes of Health School Year Biomedical Internship Award. He was staff photographer for the yearbook and school newspaper. He studies piano and plays tennis nd softball. He will major in chemical engineering at Johns Hopkins University, Baltimore, and plans to go on to medical school. John Fitzgerald Kennedy

Donna Cangemi is on the Student Government Executive Committee and is student government treasurer. She received the school's outstanding senior award. She will attend Montgomery College.

Meriam Leventhal is active with the school newspaper and is a member of the speech team. She plays hockey, soccer and tennis. She will attend Yale University in New Haven, Conn.

Lincoln Pao won the Maryland Distinguished Scholarship award, Rho Psi Society leadership award, Montgomery County Medical Society award for excellence, Wheaton Lions Club achievement award and the school's outstanding science student award. Pao is a student-government senator and a member of the debate and math teams. He will attend the University of Pennsylvania, Philadelphia. Col. Zadok Magruder

Mary Ellen Serchak is editor of the literary magazine and is active in the Philosophy Club and the American Foreign Student Program. She has traveled extensively in Europe. Serchak will attend Dickinson College in Carlisle, Pa. Richard Montgomery

Caren Lynn Sorensen has received a Maryland Distinguished Scholarship award. She is vice president of the NHS, a student-government representative and a member of the Senior Class Committee. She is on the school newspaper staff and also studies piano. She will attend Bryn Mawr College in Bryn Mawr, Pa. Pain Branch

Cathy Barksdale is an accomplished violinist and also has been on the girls' basketball team. She is interested in engineering and architecture. She will attend Bucknell University in Lewisburg, Pa.

Cathy Buckridge hs received the school's AAA award for general excellence and the social studies department's achievement award. She also was honored by the American Musical Foundation. She will attend the Winchester, Va., Music Conservatory.

Archana Surana received a Chancellor's Scholarship from the University of Maryland. Surana is a member of the "It's Academic" team. She will attend the University of Maryland.