IELTS test is designed to assess the language ability of candidate who need to study or work where English is used as the language of communication. IELTS test is more and more widely recognized as the authoritative test of English language skill. If you are planning to go to UK, Australia, Canada, New Zealand (for studies immigration or work visa) you may well be asked to do IELTS Many universities / Embassies will not even consider you application without an acceptable IELSTS Score. IELTS does not test your grammar, but your use and comprehension of the language you do not need to know a very rich grammar (for example in the proficiency) you must be able to write speak without grammar mistakes and to listen and read properly however this is not enough even in the case your English is perfect you still need to practice on some IELTS test in order to get used to the test format. The work you need to undertake depends on your current level of English and the band score you need to obtain the appropriate level of English to start practicing on IELTS material depends on the band you need if a 5.5 is enough then you can start earlier if a 7.5 is required then you fundamental have to be very strong. if your level of English is average you must start preparation of IELTS test well in advance your English will improve while doing IELTS exercises.