Internet-based test (iBT) - This is the most common format and is administered online. It consists of four sections: Reading, Listening, Speaking, and Writing. iBT allows test-takers a more flexible experience since they can take the test anytime and from any location.
Duration: The Test takes around 3 hours and 30 minutes to complete.
Scoring: Each section is scored on a scale of 0 to 30, and the total score is out of 120.
There is no grammar section, and no vocabulary section when compared to other English tests. The IBT is given anywhere where Educational Testing Services (ETS) has a test cent5er along with internet access. If your country or your area has internet access, then you need to take the IBT.
TOEFL ITP: Usually ITP is not the test you take for admission to graduate school or college. If you are writing the GRE, GMAT, SAT, or any other test for university admissions, and they require your TOEFL scores, the school does not want a TOEFL ITP score.
The ITP test is usually given in classes by teachers who wish to assess the skills of their students. It is not conducted at a special test center, and the student usually does not choose to take it. Usually, the teacher decides, and the scores are for the teacher to make use of. So you can not give this test unless you have a professor who wishes you to take the TOEFL ITP.
TOEFL PBT: The paper-based test is generally for students who live in areas without any internet-based test center. As of now, it exists, but very soon ETS will complreplace it with the IBT exam. If your area falls under the PBT zone, then it probably does not have the IBT.
PBT is a very different test from the IBT. Paper Based Test does not have the same four sections as IBT. There is a reading, grammar/writing, listening, and a separate essay section in this test. The reading and listening sections are very similar to the IBT, but not completely the same. For example, the listening recordings are usually shorter on the Paper Based Test. The PBT grammar section in PBT is completely unlike anything on the IBT. The scoring is also very different. Whereas the IBT is scored from 0 to 120, the PBT is scored from 310 to 677.
TOEFL CBT: “CBT” generally means “computer-based test.” This test is not required today because mostly it has been replaced by the IBT (internet-based test).