I was doing T&G at KFAR today AM. configured for landing, 40 degree flaps, 70 kts, nose down trim... over the fence, may be 40 ft AGL tower called for Go Around. it rattled me for a sec, but i guess it has now become mechanic reflex and i executed the go around. there was an airliner who was lined up behind me, may be its a speed thing, he couldnt slow down more or whatever, i had the right of way, the point is for students and new pilots out there, always be prepared to go around till the last moment. climbing with 40 degree flaps and nose down trim was interesting in an Archer. on a diff note, in another landing, i landed perfectly and then for some reason yanked the yoke back and then as i was approaching critical AOA, shoved the nose down and the nose wheel touched and was setting up for a perfect porpoise. CFI was about to take controls, but before he could, i went in with full power and climbed. i have read about this recovery, but reading about something on the couch and doing it when you have less than 2 seconds to respond are two different things. I had some doubts on myself that if i would be able to react and stick to my training when the time comes, now that doubt is gone. i didnt even have to think about what to do, training kicked in and i reacted. CFI was all smiles .