Lower primary - buay xi tiam (aka monkeys, keep fidgeting), you
will have a hard time calming them down. Also cannot shout,
everybody will turn and look... if they cry... then see principal.
Nowadays kids standard one.
Upper primary - majority are OK, but if you ever meet the
problematic ones... headache. A minority of the upper primary are
surprisingly worse than lower primary, so you will need the
patience.
