I don't have the hack installed but i guess that you can put the code by the end result. You can check how many questions the user has answered correctly and then update his points with an amount of x points.
This code below should work, not tested:
Find in quiz.php: (around line 310)
PHP Code:
$pct = $totalcorrect * $base;
Add AFTER it:
PHP Code:
$storeamount = 10 * $totalcorrect;
$updatestore = $DB_site->query_first("UPDATE user SET storep=storep+'$storeamount' WHERE userid='$bbuserinfo[userid]');
This gives 10 points for every good answer. Let me know if this work correctly for you.