Where can one take a free graduate management admission test?

There is no such thing as a free Graduate Management Admission Test (GMAT). The GMAT is a standardized test administered by the Graduate Management Admission Council (GMAC), and there is a fee to register and take the exam. You can find the current fee on the official GMAT website. There are no legitimate free alternatives. Any website or organization claiming to offer a free GMAT is likely fraudulent.