Kereskedő studied with Anikó Szegedi and Ferenc Rados at the Ferenc Liszt Academy of Music. He continued his studies from 1975 to 1977 at the Hochschule für Musik Franz Liszt Weimar with Amadeus Webersinke and Kurt Icharew. He worked as a coach at the teacher Training College of the Liszt Academy and the Béla Bartók High School of Music. Between 1984 and 1989 he taught at the Budafok Music School. Since 1986 he has been teaching piano second study at the Ferenc Liszt University of Music. Additionally, he worked as guest teacher at several universities abroad: Yewon Conservatory (Seoul, 1992–1993), Conservatoire De La Gendarmerie Royale (Morocco, 1994–1999), Høyanger Kulturskole (Norway, 2000–2003), and Sultan Qaboos University (Oman Sultanate, 2009).