Delta`s Key to the TOELF iBT
Delta’s Key to the TOEFL iBT ® is a set of high-quality practice materials for students
preparing to take the Test of English as a Foreign Language Internet-based Test (TOEFL
iBT). First administered in 2005, the TOEFL iBT is a widely used assessment of English
proficiency in the skill areas of reading, listening, speaking and writing.