$result=mysql_query("SELECT uyecevap from karne where username='$username' and sinif='$sinif' and denemeno='$denemeno' and ders='1' order by soruno asc limit $say,1 ;");

$result=mysql_query("SELECT uyecevap from karne where username='$username' and sinif='$sinif' and denemeno='$denemeno' and ders='1' order by soruno asc limit $say,1");