echo "<script> var students = [[],[]];";
$students = "";
for($i=0; $i<$query->rowCount(); $i++) {
    echo "students[$i][0] = " . $result[$i]['studentID'] . ";";
    echo "students[$i][1] = " . $result[$i]['coachID'] . ";";
    echo "students[$i][2] = " . $result[$i]['schoolID'] . ";";
    echo "students[$i][3] = '" . $result[$i]['firstName'] . "';";
    echo "students[$i][4] = '" . $result[$i]['lastName'] . "';";
    echo "students[$i][5] = " . $result[$i]['grade'] . ";";
    $students .= "<option value='$i'>" . $result[$i]['firstName'] ."</option>";
}
echo "</script>";