IELTS

Hi Sindhuja,
This is not explicitly mentioned on their website however they did mention the fact that ' The average GRE score of graduate students in engineering programs is around 1100 on the math and verbal sections, when combined'. Secondly, you must submit a TOEFL score and not IELTS.
I hope this helped.

Four to six months if you have studied in English medium school and speak well. Take a mock test and see if how much preparation is required and join coaching accordingly.

Hi Jayesh,
GMAT is optional and for IELTS you must obtaining an overall minimum score of 6.5 with each paper having 5.5. Please read more here:
http://courses.cardiff.ac.uk/postgraduate/course/detail/p032.html

IELTS is conducted by British Council so most of the German universities prefer IELTS.

Dear Karthik,
TOEFL is accepted too but IELTS has better preference in Europe.

Dear Meraj,
IELTS is not the sole qualifier for MBA programs, you must take GMAT and most importantly have had work experience of atleast two years.

You need at least 6.5 in IELTS for Canada.

If you want to pursue MBA or Masters in management, you need to qualify GMAT exam.

Please mention if you are looking at undergraduate or postgraduate courses?