<Tr> <Th> Score / grade validity </Th> <Td> 2 years </Td> </Tr> <Tr> <Th> Offered </Th> <Td> iBT: More than 50 times a year . </Td> </Tr> <Tr> <Th> Restrictions on attempts </Th> <Td> iBT: Can be taken only once in any 12 - day period . </Td> </Tr> <Tr> <Th> Countries / regions </Th> <Td> 4,500 test centers in 165 countries . </Td> </Tr>

Test of english as a foreign language (toefl) examination