$q1 = $_POST['q1'];
$query="";
$query2="";
if ($q1 == "c1" ) {

    $query = "UPDATE `question1` SET score = score + 1 WHERE choices = 'choice1'";
}
if ($q1 == "c2" ) {

    $query = "UPDATE `question1` SET score = score + 1 WHERE choices = 'choice2'";
}
if($query){
//execute first query here
}

$q2 = $_POST['q2'];

if ($q2 == "c1" ) {

    $query2 = "UPDATE `question2` SET score = score + 1 WHERE choices = 'choice1'";
}
if ($q2 == "c2" ) {

    $query2 = "UPDATE `question2` SET score = score + 1 WHERE choices = 'choice2'";
}
if($query2){
//execute second query here
}