TOEFL iBT is internet based test that measures your ability to use and understand English at university level.
More than 9000 colleges, agencies and other institutions including immigration agencies accept TOEFL.
TOEFL test has following sections, each of which is scored from 0 to 30. These scores are added to get a total score.
There is no passing & failing and the institutes and colleges specify their own minimum qualifying requirements.
The test can be taken any number of times and the scores are valid for two years.
The test is conducted by Educational Testing Service (ETS) which also conducts GRE, HiSET, TOEFL tests etc.
IELTS is similar to TOEFL and tests your skills in reading, writing, speaking & listening. IELTS is applicable for Australia, New Zealand, Canada & UK. IELTS is used for study, migration and work.
IELTS Academic test is for people applying for higher education whereas IELTS General Training test is for those going to English speaking countries for work experience & training programs.
The results are reported as a band scores on a scale from 1 (lowest) to 9 (highest). Score is given for each test component – reading, writing, speaking & listening. These individual scores are then averaged and rounded to produce an overall band score.
The test scores are valid for two year period.
IELTS is conducted by British Council in India
SAT and ACT are two standardized college admission tests for admission to US Colleges. You have a choice between SAT or ACT, but ACT is more popular of the two.
The tests measures your key skills like reading, comprehension, computational ability & clarity of expression and provides colleges with data to compare you with your peers.
You are required to submit SAT/ACT test scores while applying to the colleges in US.
The SAT has ten sections, including essay, reading, maths, writing and experimental. The test is mostly multiple choice. You will be given score between 600 and 2400. The new SAT 2016 format is redesigned with the scale of 400 to 1600.
SAT subject tests include SAT-Maths; SAT-Physics; SAT-Chemistry; SAT-Biology and are normally required to be taken for admission to mainly engineering courses of higher ranked colleges in USA.
SAT is conducted by The College Board.