Walton High School, Marietta GA:
Year  Rank  Index
2009  90   3.943
2008  109  3.516
2007  123  3.159
2006  184  2.56
2005  159  2.46
2003  147  2.128

Here is top 30 GA public high schools this year in the list:

Rank School Location Index Subs. Lunch E&E
90 Walton  Marietta Ga. 3.943 3 52
212 North Gwinnett **  Suwanee Ga. 2.937 21 35
213 Campbell **  Smyrna Ga. 2.935 50 40
215 Chamblee Charter  Chamblee Ga. 2.926 n/a n/a
223 Riverwood **  Atlanta Ga. 2.891 23 38
278 Davidson Fine Arts Magnet  Augusta Ga. 2.663 17 55
307 Milton  Alpharetta Ga. 2.579 4 68
309 Lakeside  Evans Ga. 2.578 16 44
311 Northview  Duluth Ga. 2.569 4 53
316 Norcross **  Norcross Ga. 2.537 52 39
327 South Forsyth **  Cumming Ga. 2.497 8 43
354 Lassiter  Marietta Ga. 2.424 5 43
370 DeKalb School of the Arts  DeKalb Ga. 2.39 n/a n/a
375 Centennial  Roswell Ga. 2.371 18 49
387 Berkmar  Lilburn Ga. 2.348 61 24
392 Alpharetta  Alpharetta Ga. 2.339 11 42.6
456 Roswell  Roswell Ga. 2.216 21 50
483 Brookwood  Snellville Ga. 2.177 17 n/a
532 Chattahoochee  Alpharetta Ga. 2.083 7 46
545 Morgan County **  Madison Ga. 2.063 38 6
562 North Springs  Atlanta Ga. 2.039 39 42
603 Duluth  Duluth Ga. 1.984 33 n/a
634 Central Gwinnett  Lawrenceville Ga. 1.941 60 26
648 Peachtree Ridge  Suwanee Ga. 1.921 20 34
687 Columbus  Columbus Ga. 1.87 19 43.5
689 Parkview  Lilburn Ga. 1.869 20 28
721 North Oconee County  Bogart Ga. 1.828 13 40
751 Wheeler  Marietta Ga. 1.782 35 31
755 LaGrange  LaGrange Ga. 1.779 48 21
809 Union Grove  McDonough Ga. 1.709 18 29

See link: http://www.newsweek.com/id/201160/?GT1=43002