Sets and reps are a Western "gym" ways of training, as opposes to an oriental "MA" way.
You pick a particular exercise and practice a certain amount of reps, eg 8 or 10, then do a certain amount of sets, eg 3 or 4.
You develop these sets on the gym equipment - the bags or pads.
At STMA we break our kb sets into 4 techniques:
Boxing:
Jab
Cross
Hook
Uppercut
Thai:
tiip
dte
knee
elbow
Round kick:
left front
left rear
right front
right rear
Hook:
lead
rear
spin
tornado
Kekome:
left
right
spin
Tornado
Jump:
body - side
body - spin
head - js hook
head - crescent