TOEFL

For Australia and New Zealand, it's enough. Some universities accept IELTS or Tofel. GMAT is not required, but for some universities GMAT is mandatory.

Both are okay but you must see the demand for the particular university you wish to apply to. It depends.

Hi Crystal Verma,
In USA it may be waived off depending on the university and your profile. But in UK it is compulsory no matter how good your academic grades might be. You must take IELTS for UKVI to study in UK.

To show your English Proficiency, you have to give these exams.

Hi Abu,
There is a TOEFL scholarship program named for India, you can check the ETS website for the same. They have certain requirements or score which you need to have in your TOEFL to be eligible for the scholarship. Other than that, a university can give you a scholarship if you have a very good profile including TOEFL scores.

To study MBBS abroad student requires an eligibility certificate from Medical council of India (MCI).The eligibility certificate can be downloaded from the MCI website. Students who have 50% marks and above in Physics, chemistry, biology and English are eligible to apply for MBBS studies abroad.
TOEFL is nothing but a language proficiency test. If English was not your medium of instruction in your education, you might have to appear for TOEFL or IELTS. This is not compulsory if English was your first language or was used as the language of instruction in your school/college.

Hi Madhav, they require and accept IELTS or IELTS UKVI. Please check such information on the university's website. The specific requirements are very clearly given. Here is the link:
http://www.kingston.ac.uk/international/studying-at-kingston/language-requirements/

Hi,
The popular guides are:
The Official Guide to GRE by ETS.
Manhattan Prep GRE.
Barron's GRE.
The Offical Guide to the TOEFL by ETS.
Cracking the TOEFL iBT by The Princeton Review.

Hi Saurabh Pawar,
They don't release any forms. You must register and create an account on the official websites of SAT and TOEFL, pay the exam fee, select the test date and center, that's it. Check college board website and ets.org/TOEFL.