去ETS的官方网站注册，基本每一天都有time slot.. in Singapore, there is only one test center, which is beside the Simlim square. You need to register and make payment online also. USD150 for Toefl.

http://www.ets.org/portal/site/ets/menuitem.fab2360b1645a1de9b3a0779f1751509/?vgnextoid=69c0197a484f4010VgnVCM10000022f95190RCRD