LinuxQuestions.org - Randomizing script quit working

Help! One of my scripts quite and I'm at a lose to see why. Need some assistance as I can't see the forest from the trees here. I use the script to randomize questions but something (someone) changed it and it no longer functions prpoerly. Can someone eyeball this and help me out? Thanks,
Al

$ cat quiz
#!/bin/bash
# Script to randomize questions
#=========================
function initialize ()
{
trap 'summarize ; exit 0' INT # Handle user interrupts
num_ques=0 # Number of questions ask so far
num_correct=0 # Number answered corredtly so far
first_time=true # true until first question is ask
cd ${QUIZDIR:=/usr/games/quiz} || exit 2
}

#=========================
function choose_subj ()
{
subjects=($(ls))
PS3="Choose a subject for the quiz from the preceding list: "
select Subject in ${subjects[*]}; do
if [[ -z "$Subject" ]]; then
echo "No subject chosen. Bye." >&2
exit 1
fi
echo $Subject
return 0
done
}

#========================
function exchange ()
{
temp_value=${questions[$1]}
questions[$1]=${questions[$2]}
questions[$2]=$temp_value
}

#========================
function scramble ()
{
typeset -i index quescount
questions=($(ls)
quescount=${#questions[*]} # Number of elements
((index=quescount-1))
while [[ $index > 0 ]]; do
((target=RANDOM % index))
exchange $target $index
((index -= 1))
done
}

#========================
function ask ()
{
exec 3<$1
read -u3 ques || exit 2
read -u3 num_opts || exit 2
index=0
choices=()
while (( index < num_opts )) ; do
read -u3 next_choice || exit 2
choices=("${choices[@]}" "$next_choice")
((index += 1))
done
read -u3 correct_answer || exit 2
exec 3<&-
if [[ $first_time = true ]]: then
first_time=false
echo -e "You may press the interupt key at any time to quit."
fi

PS3=$ques" " #make $ques the prompt for select
# and add some spaces for legibility.
select answer in "${choices[@]}"; do
if [[ -z "$answer" ]]; then
echo "Not a valid choice, please choose again."
elif [[ "$answer" = "$correct_answer" ]]; then
echo "Correct!"
return 1
else
echo "No, the correct answer is $correct_answer."
return 0
fi
done
}
#========================
function summerize ()
{
echo #Skip a line

if
(( num_ques == 0 )); then
echo "You did not answer any questions"
exit 0
fi

(( percent=num_correct*100/num_ques ))
echo "You answered $num_correct questions correctly, out of \ $num_ques total question."

echo " \Your score is $percent percent."
}

#========================
# Main program
initialize # Step 1 in top-level design
subject=$(choose_sugj) # Step 2
[[ $? -eq 0 ]] || exit 2 # If no valid choice, exit

cd $subject || exit 2 # Step 3
echo # Skip a line
scramble # Step 4
for ques in ${questions(*)}; do # Step 5
ask $ques
result=$?
(( num_ques=num_ques+1 ))
if [[ $result == 1 ]]; then
(( num_correct += 1 ))
fi
echo # Skip a line between questions
sleep ${QUEZDELAY:=1}
done

summarize # Step 6
exit 0