IELTS examination is necessary to apply practically when you reach a foreign country. The answer to this question is yes. It is very necessary to learn the skills that are taught in the IELTS examination.
IELTS is an examination that is taken for testing your basic skills of the language. The language taken into consideration is English. If you want to go abroad, you need to give IELTS examination and it is almost impossible to go over there without getting certified with IELTS.
If you are going to understand the point of view of the test takers, you will try to answer and perform in all the tests of the IELTS examination in a better manner.