Stage 3 made me so focused my teacher had to walk to my desk — I didn't hear him yelling my name while solving a problem

I have run it for a year. Stage 1 makes any kind of anxiety towards learning diminish. On Stage 2, weirdly enough it made me exercise a lot. Stage 3 is the ultimate "get into the zone" sub for me — it made me so focused that once my teacher was calling me in classroom but I was trying to solve a problem by myself. He yelled at me and yet I didn't notice. In the end he had to come to my desk to let me know. Stage 4 is hard to comprehend results-wise, but you do realize it once you have achieved something big.