TOEFL

Barron's Essential Words for the TOEFL (7th edition) is good for TOEFL vocabulary. It is made only for TOEFL vocab.

One can check the TOEFL prepration books, which is best for practice: 

• Barron's TOEFL iBT has around 7 full tests
• Kaplan and the Official Guide have around 4 practice tests each

The best book for real TOEFL questions is the Official Guide by ETS, because ETS makes the real exam.

Yes, TOEFL iBT is accepted worldwide for bachelor's, master's, MBA, and PhD programs. Just make sure the test is taken at an approved center.

For PhD programs, TOEFL score usually needs to be above 90, and many top universities want 100 or more. Some programs also look at writing and speaking scores carefully.

Most MBA programs ask for TOEFL iBT 90 to 105. Top B-schools like Harvard, Wharton, INSEAD ask for 100 or higher.

The TOEFL cut-off is usually 80 to 100. Courses like MBA, Computer Science, Law, or Engineering may need 95 to 105+.

For most bachelor's (undergraduate) programs, universities ask for TOEFL iBT score between 70 to 90. Top universities may want 90 or above, and some may ask for minimum section scores too.

Yes, for most English-taught degrees. You need to show English language proof, and TOEFL iBT is commonly accepted. The score needed depends on the university and program.

Some programs may ask for minimum scores in each TOEFL section. The TOEFL section wise requirements is 20 or more in Reading, Listening, Speaking, Writing, but not always. Check with the programme page.