A tetris is worth 8*1000=<<8*1000=8000>>8000 points
So he scored 4*8000=<<4*8000=32000>>32000 points from tetrises
He also scores 6*1000=<<6*1000=6000>>6000 points from singles
So in total he scores 32000+6000=<<32000+6000=38000>>38,000 points
#### 38000