Gender: boy
School:
School #20A
When no results for Izak Rozowykwiat came up, I shortened the search to I* Rozowykwiat, and a boy named Itcie came up. The only result, he was born in 1931, making him the right age to have attended School #20A.
A couple of other people lived at the same address as Izak/Itcie. There were no parental figures with matching addresses, but a couple of people old/young enough to be his siblings lived with him, including Chawet (b. 1929), Rywka (b. 1928), and Moszek (b. 1926).
They were all deported on the same date, March 15, 1942, which was during the month of daily deportations to Chelmno.