<form method="POST" id="loginform" name="loginform">
<p>
<label for="user_login">Email<br>
<input type="text" value="" class="input" aria-describedby="login_error" id="user_email" name="log_mail"></label>
</p>
<p>
<label for="user_pass">Password<br>
<input type="password" value="" class="input" aria-describedby="login_error" id="user_pass" name="log_pwd"></label>
</p>
<p>
<label for="user_pass">User Role<br>
<select name="role_select" id="role_select">
<option value="" selected>Select</option>
<option name="simple_user" value="user">Simple User</option>
<option name="company_user" value="company_user">Company User</option>
</select></label>
</p>
<p class="forgetmenot"><label for="rememberme"><input type="checkbox" value="forever" id="rememberme" name="rememberme"> Remember Me</label></p>
<p class="submit">
<input type="submit" value="Log In" class="button button-primary button-large" id="wp-submit" name="custom_submit">
</p>
</form>
<?php
$c_user_mail = $_POST['log_mail'];
$c_user_role = $_POST['role_select'];
$c_user_pass = $_POST['log_pwd'];
$c_enc_pass = md5($c_user_pass);
global $wpdb;
$wp_path =$_SERVER["DOCUMENT_ROOT"];
require_once($wp_path.'/wp-config.php');
$table_name = $wpdb->prefix . 'final_user_tabel';
echo $sql = "SELECT * FROM " . $table_name . " WHERE (email = '$c_user_mail') AND (userrol = '$c_user_role')";
$pageposts = $wpdb->get_results($sql, ARRAY_N);

$pass_check = $pageposts[0][4];

$email_check = $pageposts[0][2];

if($c_enc_pass == $pass_check && $c_user_mail == $email_check){}
?>

// DEMO USER

$user_id = 6;
}

// wp_set_auth_cookie($user_id);

    if (wp_validate_auth_cookie('', 'logged_in') != $user_id)
        {
        wp_set_auth_cookie($user_id);
        }

    // do_action('wp_login', $user->user_login);

    }
}