I'm not sure if the test you describe is the main admissions text which most international applicants take. It exists because there is a 25% quota on foreigners on most HSG programmes. That is a much more complex test than the GMAT. <a href="https://www.unisg.ch/en/wissen/newsroom/aktuell/rssnews/campus/2017/juli/aufnahmepruefung-hsg-11juli2017?fbclid=IwAR1g0Yh9jWsRcevcm9RSA6QXFuQgaIjPCwbln2Fp3vhjloApJs2xWf7lBTY">https://www.unisg.ch/en/wissen/newsroom/aktuell/rssnews/campus/2017/juli/aufnahmepruefung-hsg-11juli2017?fbclid=IwAR1g0Yh9jWsRcevcm9RSA6QXFuQgaIjPCwbln2Fp3vhjloApJs2xWf7lBTY</a>