I would like to repeat Martin's warning: do NOT install a beta testing version of Moodle on a production site.
Your testing will be very helpful, please create a bug report in the bug tracker for any problem that you find.
Quiz
What would be the problem if we use Quiz 1.5.3 in Moodle 1.6?
ការពិភាក្សាត្រូវបានបិទ ដូច្នេះអ្នកមិនអាចឆ្លើយតបទៀតទេ។