Teach the student per the POH and require they do it precisely that way or dont sign them off. Then when the "ship hits the sand" they will perform as POH dictates.
Keep in mind on go arounds, most of the real ones seem to happen way less than 200' AGL.
On PFLs, carb heat every 500' drop in a 152 no matter the environment.
On 152, late d/w leg carb heat on and 1500 rpm, wait until air speed drops into the WHITE so we will still have flaps on the wings when we land.
If a moose runs on the R/w in front of you when you're 25' AGL please dont do the flap carb heat throttle, do the throttle carb heat flap thingy ok?